Vice-president Josep Bartomeu says the Catalan club are not interested in selling the Spain playmaker, who Gerardo Martino has also backed to stay at Camp Nou
The Red Devils have already had two bids for the Spain midfielder rejected by the Catalan club but are willing to up their offer to €41 million in order to bring him to Old Trafford.
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"United's interest for Cesc Fabregas is obvious, he's a great player but it does not bother us," Bartomeu told reporters. "It does not matter what they offer us, we are not selling him."
He added: "If there was a higher offer, would we accept it? No. We're proud that a club like that wants one of our players."
New Barca coach Gerardo Martino, meanwhile, expressed his own desire to make the former Arsenal playmaker part of his plans for the coming season.
Martino accepted that United's interest may be considered by those in charge of running the club on a financial level, but hoped their advances would be resisted.
"I won't get involved in the economic interests of the club, but [if it's up to me] we will have him [Cesc] here," the Argentine boss said.