The comments are set to rile Rooney, who still wants out of Old Trafford.
And it could mean a move to Chelsea or Arsenal materialises quicker than expected.
Jose Mourinho last week admitted he was a huge fan of Rooney's while Arsene Wenger has the frontman on his wish-list.“If for any reasons we had an injury to Robin van Persie, we'll need him”David Moyes
Moyes, who has insisted Rooney won't be sold, said: "My thought on Wayne is, if for any reasons we had an injury to Robin van Persie, we'll need him.
"Wayne can play up on his own, he can play dropped in. It's going to be a time to see how I work with Wayne."
"I won't allow Wayne Rooney to become more important than the football club and the football team, because that's the heart of it."
Rooney has left United's pre-season tour with a hamstring injury, which is expected to keep him out of action for a month.