Barcelona suffered their first home Primera Liga defeat since April 2012 on Saturday night as Valencia registered a shock 3-2 win at at Camp Nou.
The loss has seen Barça leapfrogged by both Atlético and Real Madrid in the table, as their aura in the post-Pep Guardiola era continues to diminish.
Alexis Sanchez gave the champions the lead before Dani Parejo slotted in and Pablo Piatti nodded in for the visitors. Lionel Messi made it 2-2 from the penalty spot but Paco Alcacer swept home to give Valencia a famous victory, as Jordi Alba was sent off.
Jordi Alba is dismissed during Barcelona's defeat to Valencia
Barça's second league defeat this season allowed Atléti to capitalise, and Diego Simeone's team have sugred to the top of the table for the first time in 18 years following their 4-0 thrashing of Real Sociedad on Sunday.
Simeone has done great work at the Vicente Calderón, having guided the club to the 2012 Europa League win before clinching the Copa del Rey over Real Madrid at the Santiago Bernabéu last year.
Barcelona 2-3 Valencia
FBL-ESP-LIGA-BARCELONA-VALENCIA(01 of31)
Valencia's football players celebrate their victory at the end of the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Valencia won 3-2. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(02 of31)
Valencia's football players celebrate their victory at the end of the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Valencia won 3-2. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(03 of31)
BARCELONA, SPAIN - FEBRUARY 01: Diego Alves of Valencia CF celebrates a goal during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(04 of31)
BARCELONA, SPAIN - FEBRUARY 01: Diego Alves of Valencia CF celebrates scoring with his teammate Javi Fuego (R) during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(05 of31)
BARCELONA, SPAIN - FEBRUARY 01: Diego Alves of Valencia CF celebrates scoring with his teammate Javi Fuego (R) during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(06 of31)
BARCELONA, SPAIN - FEBRUARY 01: Head coach Gerardo Martino of FC Barcelona reacts during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(07 of31)
BARCELONA, SPAIN - FEBRUARY 01: Cesc Fabregas of FC Barcelona reacts as he fails to score during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(08 of31)
BARCELONA, SPAIN - FEBRUARY 01: Pedro of FC Barcelona reacts during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(09 of31)
Barcelona's Argentinian midfielder Javier Mascherano (L) vies with Valencia's Chilean forward Eduardo Vargas (R) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Valencia won 3-2. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(10 of31)
Barcelona's Argentinian forward Lionel Messi reacts during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Valencia won 3-2. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(11 of31)
Valencia's football players celebrate their victory at the end of the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Valencia won 3-2. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(12 of31)
BARCELONA, SPAIN - FEBRUARY 01: Jordi Alba (R) of FC Barcelona competes for the ball with Sofiane Feghouli of Valencia CF during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(13 of31)
BARCELONA, SPAIN - FEBRUARY 01: Lionel Messi of FC Barcelona reacts as he fails to score during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(14 of31)
BARCELONA, SPAIN - FEBRUARY 01: Andres Iniesta of FC Barcelona sits on the substitutes bench prior to the start the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(15 of31)
BARCELONA, SPAIN - FEBRUARY 01: Andres Iniesta of FC Barcelona competes for the ball with Oriol Romeu (L) of Valencia CF during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(16 of31)
BARCELONA, SPAIN - FEBRUARY 01: Jordi Alba of FC Barcelona competes for the ball with Sofiane Feghouli (L) of Valencia CF during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(17 of31)
BARCELONA, SPAIN - FEBRUARY 01: Andres Iniesta of FC Barcelona competes for the ball with Oriol Romeu (L) of Valencia CF during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(18 of31)
Barcelona's Chilean forward Alexis Sanchez (L) heads the ball during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(19 of31)
Barcelona's midfielder Xavi Hernandez (R) vies with Valencia's defender Antonio Barragan Fernandez (L) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(20 of31)
Barcelona's midfielder Xavi Hernandez (R) vies with Valencia's defender Antonio Barragan Fernandez (L) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FC Barcelona v Valencia CF - La Liga(21 of31)
BARCELONA, SPAIN - FEBRUARY 01: Xavi Hernandez (R) of FC Barcelona competes for the ball with Barragan of Valencia CF during the La Liga match between FC Barcelona and Valencia CF at Camp Nou on February 1, 2014 in Barcelona, Spain. (Photo by Manuel Queimadelos Alonso/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(22 of31)
Barcelona's Brazilian defender Dani Alves (L) vies with Valencia's Argentinian forward Pablo Piatti (R) and Valencia's midfielder Daniel Parejo (C) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(23 of31)
Barcelona's Chilean forward Alexis Sanchez (L) vies with Valencia's goalkeeper Diego Alves (R) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(24 of31)
Barcelona's football players celebrate after scoring a goal during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(25 of31)
Barcelona and Valencia's football teams observe a minute of silence for late former coachLuis Aragones before the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. Luis Aragones, the coach of Spain's 2008 European Championship-winning side, died in Madrid on February 1, 2014 at the age of 75, the Spanish Football Federation (RFEF) announced. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(26 of31)
Barcelona's Argentinian forward Lionel Messi (C) vies with Valencia's French defender Jeremy Mathieu (L) during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(27 of31)
Valencia's football players celebrate after scoring a goal during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(28 of31)
Barcelona's Argentinian forward Lionel Messi (CL) vies with Valencia's players during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(29 of31)
Valencia's midfielder Daniel Parejo celebrates after scoring the equalizer during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(30 of31)
Barcelona's Argentinian coach Gerardo 'Tata' Martino reacts during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
FBL-ESP-LIGA-BARCELONA-VALENCIA(31 of31)
Barcelona's football players argue with referee during the Spanish league football match FC Barcelona vs Valencia CF at the Camp Nou stadium in Barcelona on February 1, 2014. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/Getty Images) (credit:Getty Images)
Their triumph across town was their first win against Real since 1999, and they defeated their city rivals again in the league back in September.
Despite losing Radamel Falcao in the summer, Diego Costa has performed superbly and trails only Cristiano Ronaldo in the goalscoring charts.
Ronaldo was controversially sent off as Real drew 1-1 at Athletic Bilbao following Atlético's win at the weekend.