PARIS (Reuters) - The transfer rules of world soccer's governing body FIFA go against European Union laws, the EU's top court said in a ruling on a high-profile case linked to former France player Lassana Diarra on Friday, citing the bloc's free movement principles.

The decision will shake up a transfer market that is weighted in favor of clubs over players – it could also benefit leagues such as MLS.

The global soccer transfer market is worth more than $10 billion each season but is facing a revolutionary overhaul or a nuanced evolution following last week’s ruling by the European Court of Justice in the Lassana Diarra case.

Some of FIFA's rules on player transfers go against European Union laws and free movement principles, the EU's top court said on Friday, in a ruling that could open the door for players to find a new club more easily after their contract is terminated.

The European Union's top court said Friday that some FIFA rules on player transfers can conflict with European Union legislation relating to competition and freedom of movement.

The European Union's top court said Friday that some FIFA rules on player transfers are contrary to European Union legislation relating to competition and freedom of movement.

The law firm representing French player Lassana Diarra has hailed the European Court of Justice (ECJ) ruling on FIFA transfer regulations a huge success which will lead to big changes. "Stripped of its heart,

American courts reached the same conclusion as to similar restraints imposed by its sports leagues decades ago.