Rosell has blasted City and warned them off making a move for Busquets, while he also aimed a swipe at Arsenal for their raids on the club's academy by luring away their best young players.
"Now City have joined in. We are the enemy to beat. There are a lot of people who don't want us to win.
"But we must be calm - Busquets is another example like Messi, Valdes, Xavi, Puyol and the rest.
"We have great players and they are 100 per cent Barcelona."