Rooney, who made his first-team return against Newcastle United in midweek, feels that the attacking options at Sir Alex Ferguson's disposal can only be a positive.
He told the club's official website: "There is a lot of competition up front, but that is great for the squad. 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."