The England midfielder has since signed for West Ham United.
"He is a player who can unlock defences, he's got that little bit of magic.
"Everyone keeps banging on about his injuries, but why not offer him a pay-as-you-play contract, then?
"I hate seeing good players leave Arsenal. I saw when people like Robin van Persie, Gael Clichy and Samir Nasri went and doubled their wages overnight, so I could understand it from their point of view.
"However, the fact that we were letting our best players go was really annoying – and I feel like we've done that again with Jack.
"It's sad to see him go because he was Arsenal.
"He was, as the fans chant, 'one of our own', but now he's gone to West Ham. They'll be a better team with him."