Manchester United midfielder Alex Ferguson has confirmed that Park Ji-Sung could be out until January following knee surgery.

The South Korean international required an operation towards the end of last season and now faces a lengthy spell on the sidelines.

Park will be part of United's visit to Seoul later this week but, after landing in Tokyo for the first leg of his side's four-match Far East tour, Ferguson revealed the former PSV Eindhoven player will be a frustrated spectator for a while yet.

"He will not be available until December or January," said Ferguson. "It is very disappointing news but hopefully we have the squad to cover injuries this year."