Man Utd striker Romelu Lukaku must not become disheartened over recent performances and needs to keep showing endeavour and hunger to play, according to Belgium coach Roberto Martinez.
The Belgian talisman recently stated that critics should stop judging him as the 'finished article', feeling he's still young in the game (24) and has plenty more to come.
The recent swipes have cropped up as a result of Lukaku failing to score in seven matches in all competitions - a far cry from his start to life at Old Trafford, netting 11 goals in as many games.
The £75m forward had been previously backed by Red Devils manager Jose Mourinho, who claimed that Lukaku was 'untouchable' in terms of his selection for the side.
International boss and ex-Everton Manager, Roberto Martinez, has also backed the big man, claiming he is untroubled by his lack of form and assuring the striker's resolute mindset will get him back to fine fettle once more.
Speaking to Sky Sports ahead of upcoming friendlies against Mexico and Japan, Martinez revealed: "I've got a big advantage with Romelu, because I've worked with him for four years. 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."
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He dispelled any potential concern, reiterating: "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."