Concern had been growing in the United camp during pre-season that their strikers have lacked sharpness in front of goal. But sources said that the mood had been transformed by Van Persie's imminent arrival.
And Ferdinand believes that Van Persie, who scored 37 goals last season, will not disappoint.
"There have been many players who have come to Manchester United and not met expectations," he said. "Expectations here are higher than anywhere in the world - some do brilliantly and some don't fare quite so well. I've got no worries about Robin, though. He's a very good professional.
"I know his main aim won't be a selfish one - it will be all about winning trophies. And if he can score goals like he did last year then we'll all be smiling come the end of the season.
"We're bringing a big name into an environment that already has a lot of big names, especially in the forward department, so it's definitely going to shake things up. But it's going to be great for the squad."