Ashley Young, Phil Jones and David de Gea are all in camp with United in the US.
"They've done really well, all of them. No fear, no problems. None of them have looked nervous. Ash has been here since day one and has fitted in really well," Ferdinand told manutd.com.
"He played his first game and looked comfortable. The other two lads joined up a bit later - Phil Jones knows a few of the younger lads already, plus Mame Biram Diouf, so that's helped. It's been a bit easier for him than it has for David de Gea. But a few of the lads speak Spanish so it hasn't been too bad for him. I've always said it's an easy club to come into - there's such a good team morale."