The Portuguese signed Fabregas for Chelsea back in 2013, utilising the 29-year-old to great effect alongside Nemanja Matic as the West London side strolled to the Premier League title.
Fabregas has adopted a more sporadic role under Antonio Conte this season, with the Italian chiefly opting for a midfield partnership of Matic and N’Golo Kante instead.
And according to the Telegraph‘s Matt Law, United – alongside AC Milan, who are willing to bid £27m for the Spaniard – are closely monitoring his situation.
Fabregas has featured in a number of roles throughout his career: at Arsenal he acted as a multifunctional, box-to-box presence at the heart of midfield; with Barcelona he was used in a more advanced role, operating almost as an unorthodox No.10; and at Chelsea, under Mourinho, he enjoyed a deeper creative midfield role.
Indeed, with Michael Carrick now approaching the twilight stage of his career, Mourinho is clearly eyeing up Fabregas as a potential like-for-like replacement. The bustling presence of Matic at Chelsea meant that the Spaniard could sit further back and thread the ball across the pitch, maintaining the right tempo and exploiting any gaps left by the opposition.
Indeed, a combination of Ander Herrera and Fabregas could prove to have the same storming effect at Old Trafford next season.