Manchester United midfielder Park Ji-sung has been ruled out for four weeks because of a hamstring injury.
The South Korea international, who recently returned from the Asian Cup in Qatar, injured his hamstring in training on Friday.
United manager Alex Ferguson says, "It was very unfortunate because it was his last kick of the ball in training as well. We were really looking forward to having him back after being away for a month at the Asian Cup. He'll be out for up to a month, which is a blow to us."
Man United leads the Premier League by four points from second-place Arsenal.