Szczesny pulled off a couple of fine saves to help the Gunners to a 1-0 victory over Sunderland on Saturday, but he was not entirely satisfied with his performance.
He has made a few mistakes this season and appreciates that he must improve, particularly when dealing with crosses.
"I made a couple of saves that helped the team win the game and I'm happy for that but there is a lot of work still to be done," Szczesny said in the Daily Mirror.
"I still struggled a little bit on crosses so I would have been happier with a faultless performance."
Szczesny is confident that Arsenal can push on from their win at the Stadium of Light and enjoy a strong finish to the season.
He added: "We showed people we have what it takes to be successful and showed character and desire to get the result."
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