United star unhappy with patchy form

(01-10-2010) Manchester United star Park Ji-sung is very unhappy with his lack of form this season. The South Korean has been poor since returning from the World Cup with his display against Valencia in the Champions League earlier this week particularly bad. "I am not satisfied with my performances this season," said the 29-year-old on Thursday. "I don't know why my performances have not been good. Maybe I was not ready for the season. Mentally I have been weak and I have to improve.” United’s 1-0 win over Valencia at the Mestalla was the first time Park completed 90 minutes this season. "It is always difficult to get the balance," added Park. "I missed a couple of games and then played again, although since I joined Manchester United it has been like that so I should know how to deal with it."