That is the view of United legend Andy Cole, who knows all about leading the line for the Red Devils.
The Englishman netted 121 goals in 275 games in eight seasons at the club, winning five Premier League titles, two FA Cups and the Champions League.
Cole played for a host of other clubs, including Newcastle, Fulham and Blackburn, and says that the pressure to perform is much greater at United and that could be a problem for Lukaku.
The Belgium international has not started a Premier League game so far under Manchester United interim boss Ole Gunnar Solskjaer.
“When you’re at Manchester United you’re expected to score goals”
Ole Gunnar Solskjaer
The Norwegian, who replaced Jose Mourinho in December, has opted for Marcus Rashford to the lead the line and he has not disappointed, scoring five goals in his six Premier League starts.
Lukaku, who moved from Everton in 2017 for an initial £75m, has been inconsistent at times when he has been included in the starting line-up.
That said, he has still scored 24 goals in 54 Premier League games so far for United.
And Cole has offered up some striker to striker advice for Lukaku – to keep things simple.
“Go back to basics,” he said on BBC Radio 5 Live.
“I think what we’ve got to appreciate, when you play for Manchester United, you haven’t got a weekend off.
“I’m not being disrespectful to Everton, West Brom but I think when you’re at those football clubs you can have a weekend off. You know ‘I don’t have to give as much but I know I’m going to nick one’.
“When you’re at Manchester United you’re expected to score goals, you’ve been bought for big money, there’s no weekends off.
“I think at times playing under the previous manager it didn’t help because there was no creativity in the team for him.
“So he wasn’t getting many chances and the chances he was getting he was snatching and he was trying that little bit too hard.
“And I think that’s the worst thing as a centre-forward, when you try too hard.
“And as a centre-forward, if your game doesn’t start off too well, that’s where it goes.
“You’ve just got to be repetitive and say to yourself: ‘right, I’ll just go back to basics. If it comes in, I’ll play one-touch and move’.
“He’s got to play to his strengths. I think sometimes Lukaku doesn’t play to his strengths.
“His strengths are his pace and his power, running in behind.”