Rooney also pointed out that financial restrictions may play a part in United's summer plans. With Financial Fair Play regulations tightening, especially for clubs with inconsistent revenue streams due to Champions League absences, the margin for error is slim.
"Financial fair play might hit them as well, so the recruitment has to be miles better," he said. "Identify a group of players, a bit of what Liverpool have done over the last few years, and gradually get United back where they were."