As a consequence, many footballers born outside of the EU now take advantage of EU naturalisation rules to obtain a passport of an EU member country, (by for example investigating whether they had any European ancestors, or by meeting long term residency requirements), to enhance their employability across Europe. For example, many Brazilians have acquired Portuguese nationality, many Argentinians acquire Spanish or Italian nationality etc.
The ruling was made in a consolidation of three separate legal cases, all involving Belgian player Jean-Marc Bosman:
In the meantime, Bosman's wages were reduced as he was no longer a first-team player. He took his case to the European Court of Justice in Luxembourg and sued for restraint of trade citing FIFA's rules regarding football, specifically Article 17. After a tough legal battle he won his case, and on December 15, 1995 the court ruled that the system as it was constituted a restriction on the free movement of workers and was prohibited by Article 39(1) of the EC Treaty. Bosman and all other EU football players were given the right to a free transfer at the end of their contracts, with the provision that they were transferring from a club within one EU Association to a club within another EU Association. Prior to that, professional clubs in parts of Europe (but not, for example, in Spain and France) were able to prevent players from joining another club even if their contracts had expired. And in Britain, Transfer Tribunals had been in place since 1981 to solve disputes over fees between clubs when transferring players at the end of their contracts.
In addition to this, players can sign a pre-contract with another club for a free transfer if the players' contract with their existing club has 6 months or less remaining. The Bosman ruling can be compared to the Seitz decision in Major League Baseball, which led to the elimination of the reserve clause and the advent of free agency in American baseball.
On April 21, 2005, UEFA 52 member federations unanimously approved a rule designed to increase the number of locally trained players. The measure is an attempt to reverse some of the effects of the Bosman ruling. UEFA's chief executive Lars-Christer Olsson was reported by CNN to have said that some of the major clubs in Europe like Chelsea and Real Madrid were not happy with this rule, and that he did not rule out the possibility of a court challenge.