Tottenham Hotspur's season was on the brink last night when Basel seized the initiative in the clubs' Europa League quarter-final and Gareth Bale suffered a nasty ankle injury in the game's dying embers.

Spurs fought back from two goals down to earn a 2-2 draw at White Hart Lane thanks to strikes from Emmanuel Adebayor and Gylfi Sigurdsson against the superior Swiss side, but there was further cause for concern when when David Degen accidentally stood on Bale's right ankle, and the Welshman was carried off on a stretcher.

Bale will today have a scan as the club anxiously waits on the extent of the damage, although since last month's north London derby victory Spurs have shown symptoms of their annual collapse.

Defeats at Liverpool and at home to Fulham came either side of an ignominious 4-1 loss at Internazionale, with Adebayor's away goal the sole difference in their last 16 Europa League tie. An impressive 2-1 win at Swansea on last week halted the rot, but with the talismanic Bale set to be sidelined, the fear is Spurs could slip out of the Champions League berths again.

gareth bale

Bale writhes in agony after suffering an ankle injury

Tottenham were reduced to nine men when Bale was taken off after William Gallas withdrew injured after André Villas-Boas had made his three substitutions. Aaron Lennon was also lost to injury in the first period, although Villas-Boas vowed Bale, who has been linked with a transfer in the summer, had not played in a Spurs shirt for the last time.

"There is lots of swelling and the pain is obviously very, very big," the Tottenham manager said last night.

"There is a big possibility he is going to be able to make it for the Man City game [on 21 April] and he will only miss the next two games, but we can only give you that assurance tomorrow.

"Gareth will definitely play again this season."

Slack marking from Kyle Naughton allowed Valentin Stocker and Fabian Frei to give Swiss champions Basle a 2-0 lead, before Adebayor and Sigurdsson struck either side of the pause.

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  • FBL-EUR-C3-TOTTENHAM-BASEL

    FC Basel's Swiss midfielder Valentin Stocker celebrates scoring the opening goal during the Europa League quarter-final football match between Tottenham Hotspur and Basel at White Hart Lane in London on April 4, 2013. AFP PHOTO / IAN KINGTON (Photo credit should read IAN KINGTON/AFP/Getty Images)

  • Tottenham Hotspur FC v FC Basel 1893 - UEFA Europa League Quarter Final: First Leg

    LONDON, ENGLAND - APRIL 04: Valentin Stocker of FC Basel is mobbed by team mates after scoring their first goal during the UEFA Europa League quarter-final first leg between Tottenham Hotspur FC and FC Basel 1893 at White Hart Lane on April 4, 2013 in London, England. (Photo by Paul Gilham/Getty Images)

  • FBL-EUR-C3-TOTTENHAM-BASEL

    FC Basel's Swiss midfielder Valentin Stocker celebrates scoring the opening goal during the Europa League quarter-final football match between Tottenham Hotspur and Basel at White Hart Lane in London on April 4, 2013. AFP PHOTO / IAN KINGTON (Photo credit should read IAN KINGTON/AFP/Getty Images)

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Kyle Naughton (left) and FC Basel's Mohamed Elneny (right) battle for the ball.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Fabian Frei (right) celebrates after scoring his side's second goal against Tottenham Hotspur.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Jan Vertonghen (right) tries to block a shot from FC Basel's Mohamed Elneny (left).

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker goes close to scoring his sides third goal past Tottenham Hotspur's Brad Friedel (right).

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    Tottenham Hotspur's Mousa Dembele (left) rues a missed chance against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale (right) and FC Basel's Valentin Stocker battle for the ball.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker (hidden) celebrates with team mates after scoring the opening goal of the game against Tottenham Hotspur.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Mousa Dembele (left) and FC Basel's Mohamed Elneny (right) battle for the ball.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker celebrates his goal against Tottenham Hotspur.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker (back left) scores the opening goal of the game against Tottenham Hotspur

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gylfi Sigurdsson scores his side's second goal against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gylfi Sigurdsson scores his side's second goal against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale is stretchered off against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale is stretchered off against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale is stretchered off against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale is stretchered off against FC Basel.

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Emmanuel Adebayor, Tottenham Hotspur

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's William Gallas (right) leaves the pitch for treatment after picking up an injury

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale lies injured

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's manager Andre Villas-Boas checks on Gareth Bale as he lies injured

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale leaves the pitch on a stretcher after picking up an injury

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale lies injured

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale leaves the pitch on a stretcher after picking up an injury

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale leaves the pitch on a stretcher after picking up an injury

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Emmanuel Adebayor, Tottenham Hotspur

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale leaves the pitch on a stretcher after picking up an injury

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gylfi Sigurdsson celebrates scoring his side's second goal with Scott Parker (left)

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Mohamed El-Nenny (left) and Tottenham Hotspur's Mousa Dembele battle for the ball

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale in action

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    Tottenham Hotspur's Gareth Bale ties his laces

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    Tottenham Hotspur's Gareth Bale goes down under pressure from Basle's Aleksander Dragovic

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale in action

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale (right) and Basle's Aleksander Dragovic battle for the ball

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Mohamed El-Nenny (left) and Tottenham Hotspur's Mousa Dembele battle for the ball

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gareth Bale in action

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Mohamed El-Nenny (left) and Tottenham Hotspur's Mousa Dembele battle for the ball

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Valentin Stocker scores the opening goal of the game

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Scott Parker rues a missed chance after he misses from close range

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Gylfi Sigurdsson celebrates scoring his side's second goal

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Scott Parker rues a missed chance after he misses from close range

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    Tottenham Hotspur's Brad Friedel kneels dejected after he concedes the second goal

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Emmanuel Adebayor (left) and Gareth Bale stand dejected after they concede the second goal

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Fabian Frei scores his side's second goal

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Fabian Frei (right) and Tottenham Hotspur's Mousa Dembele battle for the ball

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Basle's Valentin Stocker celebrates scoring the opening goal of the game

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker celebrates after scoring his sides opening goal of the game against Tottenham Hotspur

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    Tottenham Hotspur's Emmanuel Adebayor and Gareth Bale stand dejected after they concede the opening goal

  • Soccer - UEFA Europa League - Quarter Final - First Leg - Tottenham Hotspur v FC Basel - White Hart Lane

    FC Basel's Valentin Stocker celebrates after scoring his sides opening goal of the game against Tottenham Hotspur