Van Persie was asked if rival clubs would sense weakness in the wake of Sir Alex Fergusonâ€™s retirement.
Van Persie said: "Yeah, of course they will but they can think what they want to think. It doesnâ€™t matter to us. What matters to us is the way that we work. Trust me, we will work very hard. Itâ€™s a huge challenge to all of us and itâ€™s one we are looking forward to."
Van Persie transpired to be Fergusonâ€™s last major signing when he left Arsenal to join United for Â£24million last August. He has proved a huge success at Old Trafford, scoring 30 goals in Unitedâ€™s march to the title, but is confident he can do even better this season.
"Of course it was a great year last time," he said. "It was my first year with him (Ferguson) and the first year at the club I had with him.
"But now itâ€™s a new year and I am very much looking forward to it with a new manager and great new staff. For now we have the same players."