The striker made the move from Arsenal to United during the 2012 summer transfer window and won the Premier League title in his first season.
Speaking to So Foot, the 36-year-old said: "[Nemanja] Vidic was a warrior. He put his head where normally it's scary to do so. He did anything to win. [Rio] Ferdinand, he was more 'elegant', comfortable with the ball, strong in aerial play, good in long play.
"[Ryan] Giggs was the flamboyant player, always giving the impression of being in his comfort zone. Still in great shape at 39! He did yoga and lived football all the time.
"[Wayne] Rooney was impressive in his own style too. The guy was always full on.
"Also Patrice Evra, who always spoke loudly to instil confidence in the team. Today, I know he makes 'funny' videos, but please don't believe that's all he is, as he is also a super professional and a super-intelligent guy.
"He speaks five languages – even Korean! His physical appearance shows how professional he is. His mind is as strong as his body."