The midfielder admitted he was pleased for his former team-mate, who he has spent the last four seasons playing with at Villa Park, before signing a five-year deal at Old Trafford believed to be worth £130,000-a-week.
“I’m sure Ashley can live up to expectations and deliver for the United fans, who will love him," Reo-Coker said, according to the Daily Mirror.
“People have said United are lacking a bit of flair and creativity, since Ronaldo left. I think that is something he will definitely add to Manchester United.
“He has great vision and I am sure he will create a lot of goals for them, as well as scoring himself.
“I don’t think you can say Ashley will replace Ronaldo, as Ashley is going to be Ashley Young.
“But they are similar players in certain aspects.Ashley can create and score and can also contribute to the defensive side of the game.
“But I believe he has been taken there more for his creative aspects to bring in that extra bit of flair.
“Ashley truly deserves it, as he created a lot of chances for Villa. He was very popular with the Villa fans and he served them well."
The former West Ham man believes Young and United are a good mix, with the England man keen to get his hands on some trophies.
“He is a big personality and will still be that at United, it is how he is," he added.
“Now he is in an establishment with a winning mentality and that is where he has always wanted to be to get medals and why he has gone to Manchester United.
“So I do believe he will be very successful there and will have a bright and prosperous future.
“He is confident and bubbly. He is a great lad to have in the dressing room.
“He will stand up for people if he thinks something is not right."