Rooney has experienced a busy season so far, making 22 appearances for the Red Devils and England - while finding the back of the net 10 times.
But Moyes believes the former Everton forward thrives on playing regularly.
He said: "There will be times when we do have to try and look after him.
"At the moment he doesn't need it. I look for any signs of a dip. If I saw them, I would probably look to do so.
"It doesn't need to be just now. A lot of other clubs are playing their players continuously.
"We can rotate but I will wait. If it doesn't come around and I don't need to, I won't do it.
"He is a boy who continually gets better in the games he plays.
"The point I am making is that I want to keep him playing as well as he is doing.
"If he keeps doing it I don't need to worry."