Van Persie hails Campbell impact at Arsenal
Van Persie believes Campbell, 35, has provided a positive influence in what is a young Gunners dressing room.
"He is one of those characters you need in your squad," said van Persie.
"If someone is easing off he tells them straight away, he says: 'this is not the way to do it, sharpen up otherwise it's not going to work'. We need that and I am very glad he is here.
"Of course he has his qualities (on the pitch) as you look at the way he came here and then the way he has been playing the last couple of months, he has been fantastic."