The former Gunners midfielder says his side lost a lot of quality when the Premier League top scorer left to join their rivals
Former Arsenal midfielder Emmanuel Frimpong says the club were dealt a huge blow when Robin van Persie left to join Manchester United.
Van Persie spent eight years with the Gunners, during which time they won the FA Cup and reached a Champions League final.
The Dutch attacker was the Premier League's top scorer and was named PFA Player of the Year in his final season with Arsenal, but the top-flight crown continued to elude Arsene Wenger's team.