But, despite this and the fact that Fabregas has said that he is keen to stay at the Nou Camp, United are ready to launch one last take-it-or-leave it offer.
David Moyes, who is yet to secure a major signing since taking over at Old Trafford, is willing to assign £40m of his budget to convincing Barca to allow their midfielder to move.
The Scot sees the Spaniard as the ideal man to inject further creativity into his engine room and support main striker Robin van Persie.
Although he is happy to stay with his boyhood club, Fabregas is said to be worried about his chances of regular first-team football.
The 26-year-old has struggled to dislodge either of Xavi and Andres Inesta in his preferred central midfield role, and may find it tough to occupy a more advanced position due to the presence of Pedro, Neymar and Lionel Messi.
United can guarantee him a spot in the starting XI, which may appeal to Fabrgas with the 2014 World Cup just around the corner.
Manchester United fans, can you really lure Cesc Fabregas to Old Trafford?
Tell us what you think below!