And Wenger believes that the improvement is down to the 25-year-old being a little more relaxed on the pitch, after a string of mistakes last season dented his confidence.
Dubbed 'Flappianski' by the Emirates faithful,
Wenger said: "He always felt that if he could get a run of games, then he could show how good he is.
"He always felt it [his reputation] was only on one game and he felt under pressure to show how good he is in one game. Now he is a bit more relaxed.
"He's louder than you think he is too. In the game, I am quite surprised how much he talks. He is what I call a natural goalkeeper, the rhythm of the game runs through his body. He smells what will happen.
"He is technically very gifted, after that every goalkeeper progresses and they blossom at 28 until 38.
"Of course [the mistakes he made last season] affected him. The Porto game was very bad for him," said the manager.
"The confidence problem is a very interesting subject in top-level sport. You feel it goes quickly and comes back slowly.
"If you are an established name and you make a mistake, then people say 'you have had a bad day'. If you come into the team and you make a mistake people say you are not good enough. That's a massive difference."
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