Belgium coach Roberto Martinez says Everton striker Romelu Lukaku can become the best in the world.
Lukaku recently admitted he may look to leave Goodison Park in the summer in an effort to play for a Champions League side.
"He always wants to do more in training. At a very young age he had an incredible goal scoring threat," he told BBC Sport.
"Any footballer who is special at the highest level you have to be outstanding at something; Rom it's the goal scoring threat that he carries.
"From the age of 21 to the age of 23 now he's changed a lot.
"He wants to improve, he works on his hold up play, he works on using his body, he's been working on his movement in the box.
"But what he's never ever lost is the outstanding quality of scoring goals.
"If you look at the facts there at the age of 23 I think he's got the possibility of becoming the best No 9 in world football. He's got absolutely everything."