English Premier League leaders Manchester United will be without Park Ji-Sung for four weeks because of injury.
The former Korea Republic international succumbed to a hamstring injury just a week after resuming training.
“We got a blow on Saturday with the news Park did his hamstring on Friday afternoon in training,” United manager Sir Alex Ferguson told the club’s official website.
“It was very unfortunate because it was his last kick of the ball in training as well. “
“He’ll be out for up to a month.”
Park, 29, has already missed a month of Premier League action this season after playing a key role for his country at the 2011 Asian Cup in Qatar.
The midfielder retired from international football after the tournament.
United, who are four points clear of Arsenal at the top of the table, are next in league action on February 26 when they travel to Wigan.