Tottenham Hotspur football club have won the right to fight the decision to hand the Olympic Stadium to West Ham United after next summer's Games.
Justice Collins at the High Court in London ruled that Spurs had an "arguable case" to mount a legal challenge.
The decision to award the stadium to West Ham was made earlier this year by the Olympic Park Legacy Company (OPLC).
It had been suggested in media reports that Tottenham had decided to drop their bid to take over the stadium after talks with London Mayor Boris Johnson.
But Wednesday's ruling keeps alive the Premier League club's hopes that it will be able to move from its current home at White Hart Lane in North London to the £486m Olympic Stadium in Stratford, East London.
The decision also clears the way for a challenge from East London club Leyton Orient. The League One club has said that the presence of Spurs or West Ham in the area would damage its fan base.
The stadium's 80,000 capacity is expected to be reduced to 60,000 following the 2012 Games in order to make it suitable for football.
The International Amateur Athletics Federation (IAAF) has warned that London's bid to host the 2007 World Athletics Championships would be damaged if the stadium were given to Tottenham, as the clubs plans for the site include ripping up the running track.
A further hearing will take place with a judge hearing from both sides.