Romelu Lukaku must stick to his guns under increased demands at Manchester United, says Belgium coach Roberto Martinez.
Lukaku told critics to judge him when he is the "finished article" after failing to score in seven matches across all competitions, following a stellar start to life at Old Trafford when he found the net 11 times in his first 11 games.
The 75 million pound summer signing has received the backing of his former Everton and current Belgium boss Martinez, though, who insisted he is unconcerned by Lukaku's loss of form and defended the striker's resolute mentality.
"I've got a big advantage with Romelu because I've worked with him for four years," said Martinez ahead of Belgium's World Cup warm-up matches against Mexico and Japan.
"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 demands of Manchester United," he added.