Mourinho was the man to take Willian to Stamford Bridge in 2013 and he proved to be an excellent signing having provided 44 goals and 39 assists in his 236 appearances to help the Blues win 2 Premier League titles and 3 domestic cups.
The summer transfer window slams shut at 5pm on Thursday, the day before Man United kick the 2018-19 Premier League campaign off against Leicester City at Old Trafford, but there are still areas needing to be addressed.
The Red Devils have balked at asking prices for several world-class defenders this summer, with Tottenham Hotspur demanding £70 Million for their star defender Toby Alderwield and Leicester City placing a £65 Million tag on Harry Maguire's United jersey.
Willian exit key to Chelsea Zaha move?
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Elsewhere, Chelsea will have to offer £75m to land winger Wilfried Zaha from Crystal Palace.
Zlatan Ibrahimovic was the last holder of the coveted shirt, but he vacated it in March this year when signing for LA Galaxy.
This one has been a while in the making, but West Bromwich Albion striker Salomon Rondon is finally on the verge of moving to Newcastle.
Venezuela global Rondon is in the North-East to complete a medical, with the development coming a day after Newcastle boss Rafa Benitez had voiced hope that a deal could be done imminently. The Sun believes that the German champions are willing to offload the player if Manchester United match their £50 million valuation.
"I am happy about him being with us again".
However, Sky Sports reporter Bridge ruled Bayern out of the race to sign the France worldwide.