MANCHESTER: Manchester United midfielder Park Ji-Sung will be out of action for another three weeks after suffering a knee injury while on international duty with South Korea. Park, who recently signed a new two-year contract with the Premier League champions, sustained the problem while flying home from a 2-0 friendly win against Senegal earlier this month. The 28-year-old has made just four appearances this season due to injury -- he last featured in the 4-3 win over Manchester City on September 20 -- and his latest complaint could keep him out for most of November.