Marsh told talkSPORT: "I saw those quotes from Mourinho. He's brilliant. He's a brilliant manager, a brilliant man-manager. He has the psychology of the game down pat.
"In my opinion, Rooney has fallen out of love with football. When he was younger you could see the smile on his face, he was running around, banging in goals, laughing and having fun. In the last couple of years he's got a bit angry and moody and has fallen out of love with the game.
"If Rooney goes to Chelsea he'll get back to his best. And at his best he is world class."