According to the Daily Mirror, sources in Spain claim Chelsea and United are the two top contenders for Fabregas's signature this summer. The transfer rumours come in the wake of reports that claim Barca have put Fabregas up for sale.
The 27-year-old is currently with the Spanish squad as they prepare for their World Cup defence, but speculation regarding his future continues to gather momentum.
His former club Arsenal are thought to have a buy-back clause, but Spanish paper Marca reports that Chelsea and United are leading the race at this stage.
Fabregas is believed to prefer a return to the Premier League if Barcelona do indeed indicate that he is surplus to requirements. It was a difficult season for the Nou Camp giants last term.
Despite a lacklustre campaign, they took the La Liga title to the final day of the season - only to fail to beat Atletico Madrid at the Nou Camp. That resulted in a painful second place finish, and they had to watch Real Madrid lift the Copa Del Rey and Champions League.
United are reportedly willing to offer Fabregas a bigger financial package to make him the focal point of their Old Trafford midfield. The report claims United will sanction a €6m-a-year contract for the Spanish international.
Chelsea meanwhile are very interested, but Mourinho is not willing to match those terms.