Honestly I think every pro footballer is taking some shit to survive these monster seasons with douzens and douzens of games and a world cup afterward...
Dunno. But during Guardiola reign at Barcelona it has been all but confirmed that they had some kind of doping, the same guy who helped the spanish cyclist to dope was around Barcelona at that time. But the court decided to block the publication of papers about his involvement in spanish football doping, and ordered to destroy the documents.