Romelu Lukaku joined Man Utd from Everton last week
Ryan Giggs has warned Romelu Lukaku he "will need to develop a thick skin" at Manchester United because the pressure will be immense.
The United legend has told Sky Sports News that he expects Lukaku to score goals because he is already settled in the Premier League and knows manager Jose Mourinho.
Lukaku scored 25 goals for Everton in the Premier League last season, eight more than United's top scorer Zlatan Ibrahimovic.
But Giggs said: "He will be under scrutiny that he's never had before at West Brom, or Chelsea, or Everton.
Ryan Giggs says Lukaku needs to listen and learn from the United coaches
"The pressure will be on you. So he needs to develop a thick skin, he needs to listen to the coaches, because that's all that counts really.
"And if he misses a chance, the next one that comes along he needs to put it away because, as a centre-forward at United, you're under scrutiny all the time. I think he will score goals, but you need goals from all over the park.
"I've seen a bit of (Alvaro) Morata. I've seen more of Lukaku. The pluses with Lukaku are obviously that he's played in the Premier League and Jose has worked with him before, and he's got friends. He's friends with Paul Pogba, and that makes the transition that bit easier."
Giggs believes the arrival of Ivan Perisic will give the whole squad a lift
Sky Sports News understands United are closing in on their next big signing - Inter Milan's attacking-midfielder Ivan Perisic - and Giggs believes the Croatian will have a big impact on the rest of the squad.
"If he comes, then the likes of Marcus Rashford, Henrikh Mkhitaryan and Anthony Martial have to step it up," the 43-year-old former United caretaker boss said.
"It can be a boost for all the players. It not only excites the fans but also the players, when a new player comes in."
Ryan Giggs was speaking to us in his capacity as ambassador for McDonald's grassroots football, ahead of the vote for their community awards. You can vote at here