Szczesny out of Arsenal's trip to Montpellier
The Polish international is to be replaced by Italian Vito Mannone against the Ligue 1 champions, the Premier League club said on their website on Monday.
Manager Arsene Wenger said Szczesny was still his first choice despite making a handling error that led to a goal in Saturday's 6-1 thrashing of Southampton in the Premier League.
"Wojciech is number one unless I change my mind," said Frenchman Wenger.
"You cannot change a goalkeeper every time he makes a simple mistake because then you have three bad keepers. The confidence is needed."