Belgium coach Roberto Martinez has no doubts Romelu Lukaku has improved since joining Manchester United.

Martinez worked with Lukaku at Everton.

He told The Sun: "I have seen a difference in the maturity of Romelu since his move to Manchester United.

“He is still a very young player but he has coped easily with the expectations and whatever Man United put on him.

“I can see he is really enjoying being in a team where there is very little margin for error.

“He is one of those players that sets himself little targets and you can see he's on track.

“For us, it's important that we see that continue over a ten-month competition."