He can clearly be spotted suggesting he was inches from the ball with a gesture to Austin - and hardman Keane was not impressed.
Keane, appearing on Sky Sports for a guest spell of punditry, added: "It's poor decision-making. As soon as it leaves Shane's foot you're thinking, he's in trouble here.
"He's having a good chat about it afterwards but he shouldn't, he should be straight down that tunnel and hanging his head.
"They talk about the steel in this Arsenal team. I still have huge doubts about this defence."
Arsenal keeper Bernd Leno has been slammed by Roy Keane (Image: SKY SPORTS)
Arsenal keeper Bernd Leno has been slammed by Roy Keane (Image: SKY SPORTS)
Arsenal keeper Bernd Leno has been slammed by Roy Keane (Image: SKY SPORTS)
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Fellow Sky Sports man Graeme Souness too criticised Leno for his late blunder.
He said: "You've got to have a close look at the goalkeeper here.
"He makes his mind up to go for it but having been at the near post, it's totally the wrong decision for the goalkeeper to make - to go from the near post to the far post.
"He should have backed on to his line here. It's not a great ball, that's what's tempted him."