That is the view of former Premier League boss Alan Pardew, who came up against Lukaku numerous times as a manager.
Lukaku joined Manchester United from Everton for £75million last month and scored on his competitive debut against Real Madrid in the European Super Cup loss last Tuesday.
He was the second top scorer in the Premier League last season with 25 but Pardew believes his hold-up play is something he must work on now he is at United.
“The thing about him is his power,” Pardew said on Sky Sports.
“If he gets in behind you, you are not going to catch him.
“His hold-up play is probably his weak area, coming to Manchester, that is definitely an area he needs to improve.
“His strength is goal scoring and particularly on crosses, I always thought he was a threat.
“The only time really you can gamble with him I think is when you’re high up the pitch.
“He has a tendency to come short and be a little bit lazy in his control and you can nick it off him.
“I think that is an area that he needs to improve.”
Lukaku gave United a 1-0 lead against West Ham on his Premier League debut for the club this afternoon.