Ronaldinho has been in superb form

Chelsea, funded by Russian owner Roman Abramovich, have been linked with a �50m move for the playmaker.

Rosell said: "I have a degree of fear concerning Chelsea if Abramovich is willing to invest further hundreds of millions in the transfer market.

"Abramovich's aim will be to buy one of our best players," added Barca's vice-president in The Sun newspaper.

Ronaldinho joined Barcelona from Paris St Germain last summer for �21.25m and has been in superb form for the resurgent Spanish team this season.

Ronaldinho has been quality and I bet Fergie wish he had signed him in the summer! From Cyrus Barrett Have your say on 606

But Rosell refused to comment on whether Chelsea had already expressed an interest in the player.

"I refuse to answer the question of whether we have received a bid for Ronaldinho."