Arsenal striker Robin van Persie has launched an astonishing verbal assault on Chelsea and Barcelona.
The Holland international, who is currently preparing for Sunday's friendly in Brazil, accused the Blues of 'always bitching' about referees and has told them to 'shut the f*** up'.
Van Persie claims the Stamford Bridge club spend far too long trying to influence the match officials and believes their London rivals would be better served concentrating on the game.
He told Dutch TV: "People who are watching the game on television and fans really do not want to see these kind of things.
"If you want to witness a lot of complaints, you should just go the bakery or something. There's always people nagging there as well.
"Chelsea players are always bitching against the referees. I really cannot understand that. Just shut the f*** up and focus on playing football."
Van Persie, who was sent off in the Gunners' UEFA Champions League last-16 defeat against Barcelona this season, was similarly scathing about the European champions.
He added: "They [Barca players] always go up to referees in an attempt to get an opponent booked.
"They are trying to screw colleagues! That really annoys me.
"The Barcelona players nag about everything that happens on the pitch. I was disappointed with that."