Belgium manager Roberto Martinez has backed Romelu Lukaku to return to form sooner rather than later following a run of seven games without a goal for Manchester United.

The 24-year-old was criticised on the back of the Red Devils' 1-0 defeat to Chelsea at the weekend after failing to make any sort of impact on the game, as his scoreless streak at club level continued.

Martinez, who also worked with Lukaku at Everton, believes that the striker has what it takes to adapt to the demands of life at Old Trafford as long as he sticks to his guns.

"I've got a big advantage with Romelu because I've worked with him for four years," he told reporters. "I know Romelu inside out. I think he just relishes the challenge. He's been enjoying a really good start to the season and now is a period he is ready to cope with.

"I have no worries whatsoever. All he needs to do in his career is to carry on being himself in a club with the expectations and the demand of Manchester United. For me nothing has changed in Romelu's mind.

"He is confident, he has an incredible belief in what he can bring. All I want is that he carries on seeing himself in that manner when he scores and when he doesn't, which is going to be highlighted in a club like Manchester United."

Lukaku, a £75m signing from Everton during the summer, found the net 11 times in 11 games prior to his current barren run.