Goal understands United is set to secure a world-record 110 million euro ($123M) deal for the midfielder, who left the club on a free transfer to join Juventus four years ago.
Even though Pogba made only seven senior appearances for United, Rooney remembers the France international’s physicality during their training sessions together and the England captain insists the 23-year-old has "unfinished business" at Old Trafford.
When asked by the Daily Mail what he remembers about training with Pogba, Rooney replied: “The bruises.
“He was one of those players who, when you trained against him, somehow he would just hurt you. A knee in your side, bump into you, I don’t think he meant to do it, but it just happened.
“You didn’t even need to get into a tackle. Just go next to him and you’d find an elbow or some other sharp bit. So, if he comes, I’m looking forward to that again!
“But he had great ability, some of the things he could do, and he’s gone up a level since he left us.
“I hope he is going to want to return to United and prove he’s a top-class player.
“If he is excited to play for us, we’ll be excited to have him back. I’m sure he’ll feel there is unfinished business, and it would be a very big statement by the club if they can make it happen.”
Pogba, who scored eight goals in Serie A last season, helped lead France to the Euro final earlier this month.