That’s the opinion of former Arsenal defender turned pundit Martin Keown.
He has seen the last two Everton managers, Roberto Martinez and Ronald Koeman, publicly pondering how to make the Belgian even better.
Mourinho has kept quiet about Lukaku in the press and Keown thinks that has been a masterstroke.
The £75m forward scored a brace on debut for the Red Devils, helping to put west Ham to the sword in their 4-0 opening-day win.
“Mourinho hasn’t had to say a thing”
Keown told the Daily Mail: “At the end of last season, they are two players you would have thought would be at Chelsea.
“But Lukaku and Mourinho could be a perfect marriage between player and manager.
“I don’t think I’ve heard managers talk about an individual more than Lukaku in the last few years.
“At Everton, Ronald Koeman and Roberto Martinez kept talking about how to get the best from Lukaku.
“Mourinho hasn’t had to say a thing — he has just put him on the biggest platform and the player has come up with two cracking goals.
“Now, Lukaku has got to keep producing. He has the ability to destroy defences but cannot pick and choose when to make runs.
“The biggest difference I saw in United last Sunday was their pace.
“I read that three of the four quickest players on the opening weekend were Manchester United players.
“United played at a higher tempo, passing with purpose, but when they broke on West Ham they showed more pace than they have in a number of years.”