The £22million signing from Arsenal has proved an instant hit with fans and team-mates since his summer arrival.
Ferdinand told The Sun: "The fans see how good Robin is in games but we see it all the time in training.
"Sometimes when we're practising and he produces one of those special bits of skill you think, 'Bloody hell how did he do that?' and you just want to stand there and clap.
"I'd always known he was a quality player but since he's come to United he's surprised even us with just how good he is.
"His technique is brilliant and his finishing so clinical.
"When he gets his chance he usually puts it away and, if he misses one, it doesn't get to him - he just carries on and scores with the next one.
"At Arsenal he seemed to play a bit differently. They would string a load of passes together and he was there to finish things off.
"With us he drifts from being a No 9 to a No 10, his hold-up play is really good and he goes wherever he feels he's needed."