Vieira is happy to see his former teammate back with the Gunners.
"They look like they need someone to help Robin van Persie to score more goals and get to what they want to achieve.
"I think physically he will be good. I've not spoken to him for a long time so I don't know whether he has the same hunger anymore.
"But if you go back, people have to realise that he is not 20 any more.
"People have to realise that he can still bring something else to the club. Some players can benefit like Theo Walcott and Gervinho."