Rooney joined United from Everton in 2004, and spent three years alongside Solskjaer in the first team at Old Trafford before the Norwegian retired.
He told CNN: "He's just brought smiles back to the players' faces, and brought enjoyment back to the players, but also to the staff who work behind the scenes.
"Ole Gunnar's a fantastic person, if you play with him... I pass advice on, which Ole Gunnar gave to me, which I pass on to some of the younger players now."
Rooney continued: "I remember when I was a young lad, I was on the bench, and I was sat next to Ole Gunnar, and he said to me, 'just keep watching the strikers and the defenders and watch them, watch their movements, and keep visualising what runs you can make when you come on'."