Lukaku heads to Heskey’s old stomping ground Anfield tomorrow ready to spearhead the Manchester United frontline.
But the Liverpool icon has one concern about Lukaku’s game.
He said: “I think Lukaku needs to improve his hold up play. It’s not as neat and tidy as it possibly could be.
“He scores a lot of goals and that hides him from constructive criticism, but he should look to sharpen up his hold up play if he wants to become a complete centre forward.
“Lukaku is still so young and it’s frightening to think how good he could become.”
Lukaku has scored 10 goals already this season at an average of one every 81 minutes.
That record is only bettered by Harry Kane, who has scored 11 at a hit-rate of one every 71 minutes.
Heskey told Sporting Bet: “Harry Kane has been performing just as well, if not better, than Lukaku.
“Harry Kane is scoring some phenomenal goals this season.
“I like watching Lukaku play, the way he bullies defenders and is always fighting to get into the box reminds me of what I looked to do with my game. He’s a wonderful player.”