Wilshere joined Bournemouth on a season-long loan on deadline day after falling down the pecking order at Arsenal.
"You can dress it up any way you like but it comes down to Arsene Wenger deciding Wilshere isn't currently good enough to play for his team..
"I'm looking at Wenger and thinking, 'Hang on, Arsene, you don't loan players like Jack out.' Fitness can't be the issue. If he is fit enough to play in the Premier League for Bournemouth, then he has to be ready physically to play for Arsenal.".
Redknapp added: "Wilshere just isn't part of Wenger's plans and given he has just two years left on his current deal at Emirates Stadium, what happens next summer? They will either have to offer him a new deal or sell him because Arsenal won't want to lose him for nothing.
"Arsenal could yet change manager then, with Wenger in the final year of his contract, but either way Jack has to perform and prove himself the player we all know he can be."