The 24-year-old has deputised for the injured
While Szczesny, recovering from a minor rib problem, is expected to return for the visit of Southampton on 15
He puts a large par of that down to a confidence-building and productive four-month loan spell with Hull City in the Championship.
"I have improved in every part of the goalkeeper position. In my mind as well, I came back stronger and stronger," Mannone told Arsenal Player.
"Especially after the mistake at Olympiacos - it is never easy to come back, but when I have got my back against the wall, I don't mind.
"I just roll up my sleeves and try to work because I know I can do well.
"It is a good fight between the keepers because we know the level is quite high and you need to keep working and improve yourself to get the first spot."
Mannone, though, feels his spell of regular football with Hull - during which he kept a club record six consecutive clean sheets - has given him an extra edge.
"When you are number one, you feel important and like the happiest man in the world, that sort of feeling gives me the chance to go onto the pitch with confidence," Mannone said.
"I had some good games [at Hull] and it was a great experience for me.
"The best thing was playing senior football and playing consecutive games and getting the mentality of the number one."
Mannone added: "I know Arsenal, everybody here and I am really happy when I am involved, like now.
"I would like to be involved more and more and establish myself."
Arsenal has confirmed its squad lists for the Premier League and European campaign, listing all players available, although the likes of Martinez, 21-year-old midfielder
Russia midfielder Andrey Arshavin is also on the list, but could yet move away from the Emirates before the transfer window in his home country closes, with Dynamo Moscow said to be a possible destination.
The majority of Arsenal's first team are away on international duty, with wingers
Wenger will also be keeping his fingers crossed impressive northern summer signing
English Premier League
If you are going to achieve something as mad as spending nearly 27 years in the biggest job in football, you might as well bow out in equally ridiculous fashion.