Park signed for QPR yesterday.
"We'll have to try and get in his hotel room the night before we play them and make sure he doesn't sleep so he's not running around against us at a hundred miles an hour for the whole game!" joked Ferdinand on manutd.com.
"He's always been great for us and one his greatest nights was probably against AC Milan when he did an unbelievable man marking job on Pirlo. Everyone was talking about how well he played in the dressing room afterwards and how he nullified the threat of Pirlo.
"Ji is just a great player who is really appreciated by everyone in the squad."