Ferdinand labelled Park "a real players' player" in recognition of seven years service for the Reds which saw him make 205 appearances and net 27 goals.
Always the player for the big occasion, Park helped United to four league titles, a Club World Cup and three League Cups and Ferdinand insists the winger will be missed at Old Trafford.
"Ji's a fantastic player and a real players' player," Rio told ManUtd.com. "He's been greatly appreciated by the other lads and the fans of our club over the years. He's been a great servant and never been any trouble. He's just a real selfless player who has always played for his team-mates and he was part of a very successful period for the club.
"I'm sad to see him go because he's a really good lad as well - after three or four years he really came out of his shell and was one of the lads, making a lot of jokes. As I said I'm sad to see him go as he's a really nice guy."
Ferdinand picked out Park's man-marking job on Andrea Pirlo in United's first-ever competitive win over AC Milan at the San Siro in February 2010 as one of the major highlights of the Korean's United career. And the defender admits he is not relishing coming up against his former team-mate when the Reds meet QPR in the coming season.
"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 Rio.