Park (left) is a crucial component of Manchester United's midfield

Midfielder Park Ji-sung has signed a contract extension that will keep him at Manchester United until 2012.

Park, 28, was a regular in United's 2008-09 winning Premier League season.

The South Korea international, who signed from PSV Eindhoven for £4m in 2005, has been a valuable option in manager Sir Alex Ferguson's midfield.

"I am so pleased to have a new contract," said Park. "We have achieved great success over the last four years and won many trophies."

He told the club's official website: "I appreciate all that Sir Alex and the staff have done for me, but I have to mention the fans too, as they are incredible.

"It is a great experience for me to play at this magnificent football club along with other world famous players."

Ferguson said during the summer that he was always confident a deal would be done with Park, whose wages are estimated to be about £65,000 a week.

606: DEBATE Give your reaction to Park's new deal

The only Korean to hold a Champions League winner's medal, Park began his professional career in Japan in 2000, with Kyoto Purple Sanga.

Three years later he made his move to PSV Eindhoven, where in two seasons he scored 13 goals from 64 matches.

He has been on the scoresheet nine times for United in 87 appearances, and scored in each of the last two World Cup finals.

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