", the forward said ahead of Tuesday's Champions League clash between Juventus and Manchester United, another of his ex-clubs.
However, the Portuguese batted away a series of questions from Spanish and Italian journalists on whether a Real return would interest him at Old Trafford on Monday, highlighting that he signed an extended contract just this year till 2020.
Real Madrid narrowly avoided setting a new club-record goal drought as they fell to their fourth defeat in five games with a 2-1 loss to Levante at the Bernabeu.
When the prospect of returning to his former club was mentioned, the Portuguese reiterated his commitment to United.
"We are playing against one of the biggest clubs in the world, one of the candidates for the competition and that is what motivates me and brings me here".
"I'm absolutely fine with them", the five-time Ballon d'Or victor told reporters.
Speaking at his media conference ahead of Tuesday's Champions League clash with Juventus, Mourinho - who's future at United has been the subject of intense speculation in recent weeks - said: "I'm happy here".
However, Isco doesn't believe his new coach deserves to be fired.
"I don't like this press conference", Mourinho said when asked about the United midfielder.
"If you want to see a defeated coach then don't look here". We trust in the staff that we have and in what we have done.
He said: "I think it would be insane (to sack him), you have to let him work". If you get rid of the coach you have to get rid of all of us.