Former Arsenal striker Paul Mariner says Romelu Lukaku could succumb to pressure now that he joined a world class club.
The Belgium international signed for Manchester United to become one of the most expensive transfers of the summer.
He enjoyed a phenomenal campaign last season at Everton but Mariner says Old Trafford is a completely different environment than Goodison Park.
"With no disrespect to Everton, in previous seasons playing for Everton in a No 9 shirt, there's not that much media coverage, there's not much pressure," Mariner told ESPN FC.
"Liverpool, yes [there is].
"But when you pull the No 9 shirt on for Manchester United, and it depends who you talk to whether it is or one of the biggest clubs in the world, the pressure is incredible because it's every single day.
"The pressure is there every single day. They will be asking questions about Lukaku. What's his form like?
"They'll be observing him in training, they'll be observing what he's doing on the field.
"I think that if he can handle the pressure then that is one aspect of being a No 9 at Manchester United.
"But the biggest ask that I have about Lukaku is in those tight areas, when teams are going to sit in, when teams are going to defend deep, has he got the quick feet to open up defences and finish? I don't know.
"It is a no at the moment, I hope he does well. At the moment, from what I've seen at Everton, I don't see him being a success."
