The World Cup victor reportedly informed United bigwigs that he wanted to quit Old Trafford for Barcelona.
Mourinho's blatant plea came amidst a groundswell of anger at the antics of the Man United board.
The United boss is facing a barrage of criticism after a miserable end to the transfer window.
The future of Manchester United and French worldwide midfielder Paul Pogba at Old Trafford remains a mystery as the transfer window slowly begins to close as conflicting reports continue to surface.
The centre-back discussion has only become an issue this summer, and the club have felt that the options open to them have not warranted the investment they would have required.
Mina was regarded by United as far off the level that they wanted in a centre-back and there were concerns about his all-round game.
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Manchester United manager Jose Mourinho has said finishing second behind Manchester City last season feels like one of his "biggest achievements" as a manager in football after the criticism he has received.
A new season begins tomorrow with Manchester United looking to catch up to neighbours City.
Internally, the greatest frustration for Mourinho has been waiting for the return of those players who had the longest World Cup campaigns. They seem to have learned not to sign players whom Bayern Munich are ready to offload after the Bastian Schweinsteiger failure. "We have a very good squad, with very good players and it is very hard to add players to that", he said.
"But it's the same conversation as with (Ashley) Young, (Marouane) Fellaini, (Jesse) Lingard, it's the same".
"I do not trust that new players will arrive and I'm not confident in that so now I will only focus on the players I have", he said.
"I have my players and I like my players", Mourinho said.
"It is hard to understand for people in football that Tottenham didn't sign or didn't sell players but sometimes in football, you need to behave different".