Fred has expressed his delight at plsying for Mourinho.
The Brazil international has revealed the Manchester United manager was the "crucial" reason why he decided to sign for the club, despite having discussions with Manchester City.
Speaking ahead of the Manchester Derby at the Etihad on Sunday, the midfielder, who joined United for £52m during the summer said he didn't hesitate when United asked for his signature.
"That's true, I received an offer from them [City] and even talked to my Brazilian team-mates who play for our neighbours," said Fred, in an interview with Four Four Two.
"They were trying to convince me to join them, but in the end it didn't happen. Then it was the summer and, as I said, there were other offers, including from United. I quickly decided that was the right move for me.
"Mourinho is a top, top professional and every player likes to work with such a winner. I'm learning things from him, that's for sure. He can be quite strict, but that's part of his job.
"He's also friendly and funny off the pitch, and jokes with us in the dressing room. Jose was crucial in my decision to join Manchester United and I'm grateful for his interest in my football."