"It's a tremendous honour when you return to a club where you've been, but I'm talking to you and I will not talk to anyone else".
The Sun reports that United agreed to the payment following a meeting between Mourinho's agent Jorge Mendes and United executive vice-chairman Ed Woodward.
This week the Portuguese coach reportedly received an offer from Benfica, but he has stated that he isn't thinking about returning to work in his native country.
His final months at Manchester United, however, have put a blotch on an nearly impeccable career to date, something which Mourinho will be eager to rectify at whatever club he decides to go to next.
Mourinho was sacked by Manchester United last month and the Red Devils have won all five games under interim replacement Ole Gunnar Solskjaer.
"If any professional - a manager or a player - is wanted by a former club, it means we did something positive", he told Correo da Manha. It's not a gamble in the dark, the clubs are trying to hire a player or a coach they know, they've already been there, and if they invite you it's because they know the value of the person.
"When you leave a club, you do not wash dirty clothes, when you leave a club, you do not seek to, at least publicly, do any kind of criticism, it's an ended chapter and that's how I always did it".More news: Tennis match-fixing ring under Spanish police investigation
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"The other thing I have learned is to respect the clubs who want me and those who don't want me".
But the 55-year-old has ruled out a return to the Primeira Liga.
Benfica sacked Rui Vitoria as manager last week, leading to reports Mourinho was under consideration.
"I have never confirmed, nor denied any offers throughout my career", he added.
They say you can't keep a good man down, so many will be wondering what the hell Jose Mourinho does to be able to bounce back every time.
"If I were, Benfica would be the first to know my decision".
'But also helping a little to withdraw the conversation on the subject, I think I can say that at this time, today, I have no intention of working in Portugal'.