Considering the fact that he is approaching his peak years, he decided against remaining with the Londoners, and jumped at the chance to sign for Mourinho again - albeit for United this time.
'You don't want to come to a club and behave like you are passing through.
Still over three weeks of this left, folks.
From United's perspective, Matic's arrival also carries the additional bonus of weakening one of their main rivals for the title this term.
Costa's rollercoaster Chelsea career is ending in acrimonious fashion, but Lampard thinks now is the right time for player and club to part ways.
There are actually few significant questions, but they're all interconnected to the biggest of all: can Chelsea possibly be as good as last season? He's a very select player who's a top, top striker, but when the position goes so far it's hard to put it back.More news: Former Chelsea Star: Why Mourinho Will Win The EPL With Man Utd
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Redknapp believes the Brazilian-born star represents one of the best strikers of the Premier League era and claims there is little in Morata's track record to suggest he is capable of filling the void.
"With the players and the characters we have in the building we won't let it".
"I think Sanchez is worth that, even if you know you'd get £50million for him now and he'll leave next summer on a free".
"I do think he's got the natural talent to come in and score the 20-plus goals that Diego Costa scored previous year".
"Matic knows very well what I think about him - the importance for me about this player, who is a really good player, a top player, very important for our team", he told Sky Sports.
"I think he's the type of manager who won't accept the involvement from people above, especially on the back of winning the title".
"Alvaro is working well, improving a lot his physical condition and starting to understand what I want about him". You have to have faith in the manager.
Liam is ESPN FC's Chelsea correspondent.