Manchester United winger Park Ji-sung has revealed he is not at all happy with his form so far this term.
The South Korea captain is unhappy with his contribution to the team and admits he has to improve mentally to help pick up his output.
"I am not satisfied with my performances this season," he said.
"I don't know why my performances have not been good. Maybe I was not ready for the season.
"But mentally I have been weak and I have to improve.
"In the first-half last night (against Valencia) my performance was bad but at least the second was better.
"It is always difficult to get the balance," Park added.
"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."
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