Roberto Martinez told Romelu Lukaku to study the movement of three fellow strikers during their spell together at Everton.
Martinez was in charge of Lukaku for three seasons at Goodison Park and has since been reunited with the striker as manager of the Belgium national team.
And Lukaku has revealed that Martinez told him to learn from three forwards during their time together at Merseyside, in order to improve his movement in front of goal.
'I've improved my movement, especially in the box,' Lukaku told Belgian outlet DH.