Lionel Messi is upset that Barcelona are fighting FIFA over his release for Argentina's Beijing Olympics campaign.

AS says Messi has been sulking during the club's tour of Scotland and shocked teammates on Tuesday night with an out-of-character lunge at Rafael Marquez in training. Barca coach Pep Guardiola was forced to step in to calm the Argentine.

Even yesterday, Messi was visibly apathetic and half-hearted in training.

FIFA are demanding all clubs release their U23 players for the Olympics, but Barca insist they need Messi for their crucial Champions League qualifier next month.