Chong is on-loan this season at Birmingham City.
"He's a good player," Rooney said. “He's a player who obviously went out to Germany last season, it didn't quite come off for him there.
“Obviously, he's a very talented player, he played against us in the preseason and yeah, he's an impact player, he has good moments in the game.
“So, of course, we'll have to be wary of him and make sure we're on our toes and we're defending well against him because if we give him time and space, then he's a player who can really hurt you."
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