Although still comfortably United's top scorer with 12 goals to his name in 20 appearances across all competitions to date, the Belgium worldwide, a £75m ($100.3m) summer arrival from Everton, has now netted in only one of his last 10 appearances at club level - a late effort in the 4-1 comeback defeat of Newcastle United on 18 November.
The £75million forward will not face any retrospective action for the incident during United's 1-0 win.
"In the last minute he was fighting and running back like he was in the first minute, so I think it is also a mentality question", Mourinho said of Lukaku. "Some are capable of going to the limit of their efforts but others, even with a lot of talent, are not able to".
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"Unfortunately, not every player is the same".
Manchester United are on the brink of losing Romelu Lukaku to a potential three-game ban after a footage emerged of him kicking Brighton defender Gaetan Bong in the groin, some sources have told ESPN FC. So Romelu, for me, was fantastic.
Watford also face a testing run of games that includes a visit from Tottenham and a trip to fellow overachievers Burnley, but Silva has only eyes for United for now.
"We had 5 games to watch at 3pm. It will be a tough game for us but we can play with confidence".