Head coach Unai Emery sanctioned a £19million deal for the Germany global but the 26-year-old has been forced to play second fiddle to Petr Cech who has started all five of Arsenal's Premier League games so far this season.
Cech has kept his place despite an indifferent start to the campaign, which has been blighted by suggestions he is not suited to Emery's approach of playing out from the back, something Leno was renowned for at Leverkusen.
'I came for the Premier League.
The coach always makes the starting XI because of the performance.
"And for Leno... I think that we conceded two goals but not for a mistake. We have got four wins on the bounce now so we have just got to keep on going keep this momentum going and try to get as many wins as we can, like I'm saying". "I think I did a good job with the ball, with the passing".
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However, he is yet to start in the Premier League, with Emery largely favouring Guendouzi and Granit Xhaka in the centre of the pack.
"But we need to continue to improve on this because in the last minute in Newcastle and again today in the last 20 minutes, we conceded two goals". I train very hard and maybe it needs a little bit of time.
"In the first half, the opposition was very deep, so we had big problems getting chances".
Leno - who has six Germany caps - revealed Emery has not come to a specific arrangement with his goalkeepers over who will play in which matches, and added that he has a good working relationship with Cech.
"It is a little bit more of a risk to play this way because we don't want to kick the ball up front". We want to play because we have the players to play from the back to have more space in the opposite 18-yard box.