Keane described Ferdinand's performance as "ridiculous".
He rapped on ITV: "David Moyes took the heat off the players before the game by saying it is his responsibility but we are talking about experienced players.
"Rio Ferdinand's decision making, the chances he has taken, it is ridiculous. It is like his debut tonight.
"As we said before the game, there are big question marks over the manager and the players. That for Manchester United is certainly not good enough."
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