Arsenal hero Ray Parlour says they must do what they can to keep hold of Robin van Persie.
Van Persie is out of contract in June 2013 and has so far refused to discuss terms over a new deal.
Parlour, who won three Premier League titles with Arsenal, told The Sun: "For me, the biggest signing they can make this summer is Robin van Persie.
"He'd be a massive loss if he left but if he doesn't sign a new deal this summer, they'll have to make a decision to sell him.""He's in a very strong position with one year left on his contract. Arsenal can't afford to let him go on a free transfer, so they couldn't keep him for a season.