"Shinji's settled quite quickly," he revealed. "He's a talented player, he likes to get on the ball and keep it simple.
"He's very effective on the ball. It's great to have that sort of player in the team. I'm looking forward to playing with him and I think he'll create a lot of chances for myself and the other forwards. It's exciting to have him in the team."
Rooney also responded to Usain Bolt's plea for a trial at United, joking: "He'd obviously add a bit of speed to the team! But they are different sports. I think he's best staying on the track!"