Andrew Cole has warned new signing Wilfried Zaha hard work is the only way to get into the Red Devils first team.
Cole urged to learn from Ryan Giggs if he wants to establish himself at the Premier League champions.
The 20-year-old has impressed in pre-season and has been named in the England squad to play Scotland next week.
And Cole, who netted 121 times for United, said Zaha now has to work hard to force his way into new manager David Moyes’ starting line-up.
He said: “Zaha has come in, put a good shift in pre-season and now David Moyes can make his mind up from there.
“Everyone starts from a clean slate so to speak, as it’s a new manager with new ideas and he’s going to pick the team that he thinks can win the championship.
“So I think Zaha is going to get a good opportunity and that is why he has come to Manchester United in the first place.
“But he’s just got to come in and enjoy the experience because he’s playing with some quality players and he will learn from them.
“He only needs to look at someone like Ryan Giggs and he will know what level he needs to get to to be a success at Manchester United.”
Moyes said he has been impressed by Zaha so far in training and is hopeful he can make an impact in his first season at Old Trafford.
And Cole, who started his career at Arsenal before moving north and making a name for himself at Newcastle United, believes Zaha’s family will make sure he copes with life away from London.
The 41-year-old added: “No doubts he will have his friends and family around to help him too.
“He’s a young boy, but when you come to a club like Manchester United, everyone makes you feel very welcome because it’s a family club.
“All I would say to him is to enjoy it. It’s totally different to Crystal Palace, but he’s now at Manchester United and he’ll have to work extremely hard to get in the team.”