Cleverley has recalled thatSergio Aguero goal which meant United lost the league to City in 2012.
He told manutd.com: "I'll never forget in the dressing room after that game. The manager said to us all: 'I told you. That's why I wanted you to be more ruthless and really kill teams, because you can lose leagues on goal difference.'
"And he was right. We'd gone in after beating teams 3-0 or 4-0 that season and he still hadn't been happy with us in the dressing room. That's how much of a winner he was, how ruthless he wanted us to be. If we'd done that, scored more goals, really killed teams, we'd have won the league in 11/12.
"But had we done that, would we have had that real determination to win it the next year and win it as convincingly as we did?"