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Manchester United have upped the stakes in their bid to sign Cesc Fabregas.

But United face a fight to convince Barcelona to accept their new £30million, plus add-ons, offer

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Barca are understood to be reluctant to consider the bid until a successor to Tito Vilanova as manager is appointed and decides whether he wants Fabregas.

If United can find a breakthrough, they will tell Fabregas he can double his £100,000-a-week Barca wages by moving to Manchester this summer.

Sunday Mirror Sport understands Fabregas will consider a switch to United if Barca accept a bid for him and is now waiting to see what develops.

Uncertainty surrounds the Nou Camp, following the shock announcement that boss

because of illness.

(Image: Manuel Queimadelos Alonso / Getty)

Fabregas’ Barcelona contract runs to 2016 and includes a £25m buy-back clause for his former club Arsenal.

Apart from offering Fabregas the chance to take over from Paul Scholes, United would also be prepared to put the Spaniard in line with his ex-Arsenal team-mate Robin Van Persie and pay him around £200,000-a-week.

A Spanish source said: “Manchester United are deadly serious about signing Fabregas and have made a second bid.

“There is a lot of uncertainty at Barcelona at the moment and it is hard to predict what will happen.

“But one thing is for sure and that is that Fabregas could earn a lot more money by joining United.

“That will not be his top priority, but United hope it will help them to clinch a deal.

“Cesc had been planning to stay in Barcelona for at least one more year, but if the club accept a bid for him, then, of course, he will have to think about his future.”

Before announcing his decision to step down, Vilanova revealed Fabregas had told him he wanted to stay at Barcelona.

But president Sandro Rosell did not make any firm statements regarding the future of Fabregas.

Rosell insisted that Barca stars such as Lionel Messi and Andres Iniesta “don’t have a price”, but did not mention Fabregas in that category of untouchable players.

That has given United hope that Fabregas does have a price and it is now a matter of whether they have matched it. Chief executive Ed Woodward

Other than Fabregas, United boss David Moyes is interested in his former Everton midfielder Marouane Fellaini and is also considering an

United know that any move for Bale would be highly complicated and would most likely run late into the transfer window.