The Frenchman, who starred in the Premier League during his career in north London, says Arsene Wenger is missing a midfield man in the mould of Patrick Vieira.
Pires is far from the first onlooker to suggest as much, of course, while he has praised summer signings Alexis Sanchez, Danny Welbeck and Calum Chambers.
But the 41-year-old says the Gunners need a tall, strong player, as Arsenal are missing physicality - an essential quality in the Premier League.
“I think Arsene Wenger has a very good team at Arsenal but I do think they need one player in midfield in the mould of Patrick Vieira,” the Frenchman told Sky Sports.
“They need a tall player, a strong player because in England you need players who are physical. That position is very important and I think that is the only missing piece.
“That aside everything is good because they have some good creative players and Wenger has bought some good young players like Alexis Sanchez, Danny Welbeck and Calum Chambers.”