The former England international was part of BT Sport’s punditry team for caretaker boss Ole Gunnar Solskjaer’s first game in charge at Cardiff.
Red Devils thrashed the Bluebirds 5-1
After the match, Rooney opened up on the Portuguese’s style of management and in particular, one thing that surprised him about working under the 55-year-old.
“The game has changed, you can’t just go in and hammer players,” he said.
“Where the players earn enough money now, you lose the players, you have to go into it in a different way and try and keep the players on your side the best managers know how to do that.
“In my opinion, obviously having been there with him for a year, he didn’t [keep the players on his side].
Rooney was in the BT Sport studio for Cardiff vs Man Utd (Image: GETTY)
Rooney won three trophies in the 2016/17 season
“That was the one surprise that I had, that his communication with the players wasn’t as much as it could have been.”
As he reaches the tail end of his career, the 33-year-old admitted that he is beginning to think about management.