The striker struck twice in victory at Swansea City.
"There is always room for improvement everywhere but every other department of Danny's game is fine," said Ferdinand.
"It is just the goalscoring.
"Many people forget he was playing on the wings a lot of the time last season but you still expected him to score more goals.
"You can tell from the way he has approached the season, the way he is training and the way he looks at the moment, he has got it in his head he wants to get on the goalscoring sheet.
"You can see that in the positions he is taking up. He is a lot more threatening now."
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