The Court of Arbitration for Sport has told Fifa its anti-doping regulations do not correspond fully to those of the World Anti-Doping Agency (Wada). But the court added Fifa is not legally obliged, under Swiss law, to modify any of its existing rules.
Fifa and Wada made separate applications for an advisory opinion from the court after years of dispute.
Fifa has not accepted Wada's code that states a player's first offence should automatically attract a two-year ban.