Fellaini has proved a vital cog in Mourinho’s side since his arrival as manager at Old Trafford last year.

And Belgian journalist Kristof Terreur has revealed how the Portuguese has got the best out of Man Utd’s towering midfielder.

“Fellaini has been very happy since Jose joined,” he said on The Transfer Window podcast.

“A phone call from Jose Mourinho two summers ago persuaded him that this manager believes in him.

“Everybody knows how Mourinho works and I know Fellaini pretty well and I knew it would be a match made in heaven.

“He’s a guy who does everything he’s asked, he always works hard in training, never complains and is the perfect squad player.

“Jose uses him in the way he likes to be used. Sometimes as a defensive midfielder, sometimes as the second striker he likes that variation in his game.”

Fellaini is out of contract at the end of the season but Terreur expects him to stick around long-term in Manchester.

“I don’t think they’ll him go that easily because his contract is running down,” he added.

“I expect they will offer him a new deal - something no-one would have expected two years ago.”

Fellaini is currently away on international duty with Belgium.

He's a likely starter for Man United away at rivals Liverpool after the international break.