Manchester United boss Mourinho has spent the last two years trying to solve his Pogba conundrum, with the France international yet to live up to his £89million price tag.
He has impressed for his country, helping Didier Deschamps’ side win the World Cup in Russia, but has struggled at Old Trafford.
Signs of improvement, however, have been forthcoming. In recent matches, Pogba has finally resembled the player Manchester United thought they were signing in 2016.
And Crooks thinks Fellaini has been the key, with Mourinho now making the Belgium international a regular in the heart of midfield.
He told the Metro: “He seems to be coming to terms with his responsibility on the football field and I love that.
“I think he’s a top class football player we saw how he ripped Man City apart last season
“I think with Fellaini alongside him who looks like a pillar in that team.
“I never thought I’d say this but the one person, it was in front of your nose all the time, too close to perhaps see, has come in and done a great job.
“He was sensational against Watford. He’s discovered a gem.”
Pogba scored twice as United beat Young Boys 3-0 in midweek.
And, speaking after that game, he expressed a desire to build on that showing.
“It was very important because it was the first game in the Champions League and we needed to start well,” he said.
“We did it and got the result we wanted.
“Maybe the performance should have been better but we have the result and the three points so we are very happy.
“I’m happy as well to score the goals that were decisive in the win.
“If I can do it I will try to help the team as much as possible.
“If I can score a goal or make an assist that will be great.”