That is according to UK sport psychologist Phil Johnson, who thinks Lukaku is mirroring Mourinho’s temperamental attitude.
Lukaku has come under fire for a recent goal drought and responded last week when netting against Bournemouth and West Brom.
The Belgium international did not celebrate either goal, leading to claims he may be unhappy at United.
And Johnson thinks Lukaku’s current attitude is because of how Mourinho is treating the centre-forward.
“Romelu Lukaku’s behaviour is reflecting Jose Mourinho,” Johnson, speaking to BetStars News, said.
“I know the Belgium management team. Lukaku is a young guy, like Anthony Martial, who needs support.
“If he played for Pep Guardiola, he would have a totally different relationship where he would receive a different style of support than what he gets from Mourinho.
“Lukaku needs the ball to score. Look at Radamel Falcao when he went to United and he only scored a couple of goals, then comes back to Monaco and he’s top scorer.
“At Everton they played to Lukaku’s strengths, but they aren’t doing that at United, despite his good start.
“I think for Lukaku not to celebrate is disrespectful to his teammates, to himself and it reflects his manager’s approach.”
Lukaku is currently fourth in the Premier League top-scorer charts, with 10 goals.
He has also provided four assists this season, more than Mohamed Salah, Harry Kane and Raheem Sterling, who all sit above him in the scoring charts.
United sit second in the Premier League table – 11 points behind Manchester City.
The Red Devils play Bristol City in the EFL Cup quarter-finals on Wednesday, although Lukaku may be rested for that clash with the busy festive period in Mourinho’s mind.
