Mourinho did not want Mata and recently critized Hazard for shunning his defensive duty against Atletico Madrid, so it is no suprise that he would not be interested in Fabregas.
Suprised Arsenal are not going for him. They can adopt a 4-2-2-2 with Ozil, Walcott, and Fabregas alternating in the attacking mid and forward roles. Maybe, it because they will have too many numbers 10 and are looking to add pace to their attack. Same with United in regards to having many number 10, so I hope we also remain uninterested in him. If Mourinho is not so imbued in his own football philosophy, Fabregas would be a great addition for his team.