With Rooney now recovered from injury suffered last month, United boss Sir Alex Ferguson now has five top international forwards to select from ahead of Saturday evening's Premier League encounter with Tottenham.
"There is a lot of competition up front, but that is great for the squad," said Rooney.
"The manager will rotate when he feels it is necessary.
"There are a lot of games throughout the season. It means we can get a rest here and there to make sure we are ready for the big games towards the end."