Sure he's not injured? the last two times he missed 4 games, it was confirmed as an injury when he was returning. played 8 mins off the bench and then out again. i'd bet it was a recurrence of the same injury.
Van Nistelrooy's quote when they rejected bids from Sunderland for him in Jan/Feb: "Selling Kasey was impossible. He’s a very important part of our survival bid. He’s done great things for us on the wings."