Nemanja Matic has said that although Jose Mourinho is not always easy and can be very demanding, the Manchester United boss is the best he has worked with.
Matic was reunited with Mourinho in the summer after moving from Chelsea to United in a £35 million deal.
The midfielder won the Premier League title under Antonio Conte last season, but told Serbian magazine Elevate: "Mourinho is a brand, and the best coach I've ever worked with.
"Sometimes it isn't easy to work with him, because he always demands more. Even when you play the best match in your career, he considers that you can play better in the next match.
"I cooperated excellently with him at Chelsea, and the fact that Mourinho is the coach at Manchester was the decisive factor in choosing my new environment.
"Privately he's completely different from the way he is perceived by the general public. This is a man who possesses all human virtues.
"He's not at all cold or conceited, as he is presented in the media."
Matic won two titles at Chelsea, the first of them under Mourinho, and said his aim was to "achieve the results that previous generations had" at United.
He added: "Mourinho has created an excellent group of players with huge potential, and everything is there for us to achieve good results.
"I don't want to talk about the goals of the club, but when I mention Manchester United I think the ambitions are clear to everyone."
Matic has made a good start to his United career, and revealed that it may not be too long before another Matic is wearing red after six-year-old son Filip earned a place in the junior set-up.
He said: "The fact that I'm playing for United is the pinnacle of my career and of everything I've achieved in football.
"I really like it in Manchester, and the family has got used to the city. I needed very little to make me happy in my new environment -- just to be together with my wife Aleksandra, my six-year-old son Filip and three-year-old daughter Tea.
"The children have a good school in Manchester, and I'm particularly glad that my son started football training. He has a place reserved in United's junior ranks."