Ji-sung played a key role in the United team that managed to retain the Carling Cup by beating Aston Villa on Sunday.
“We could win the Premier League and the Champions League. We are thinking about that,” said Park.
“We just have to do the same as last year and remain focused on every single match.
“I feel confident. Winning the League Cup set us up for the rest of the season so now we will just keep trying to win all our matches and see where we end up.”