Welbeck has not started as many games as he would have liked this term.
But Rooney said: "Everyone labels him as a striker, which I have had at times when I have played in different positions.
"Then someone says I haven't scored for eight games when I hadn't played up front.
"Danny has been out wide a lot this season. He works hard and brings a lot of energy to the team.
"He is a great player and his time will come when he gets that run up front. Then I am sure he will score goals."