Man Utd defender Ferdinand: Van Persie made big difference
The pair have become close as Ferdinand drove Van Persie to Carrington daily for training.
"Robin has been a big factor," said Ferdinand. "Last season, we lost on goal difference which tells you that we didn't score enough goals. We brought in a man who was top scorer last season and he looks like he is going to do that again this season. He has definitely added to what we had already."