Goalkeeper Wojciech Szczesny will miss Arsenal's opening Champions League Group B tie at Montpellier on Tuesday because of an ankle injury.
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."
Bayern fans snap up 45,000 tickets to watch Champions League final live at Allianz Arena
When Sir Alex wakes up on Monday morning without team to manage, he will not be putting his feet up
Paris Saint-Germain midfielder announces he will be retiring at the end of the current season
Record goal-scorer signs a one-year contract extension with Europa League winners Chelsea
Ten years on, the legends speak to FFT
Your questions answered by an A to Z of legends
He's here, he's there, he's...
The cost of Premier League away travel
Nike CR7 IX for you
FourFourTwo is brought to you by Haymarket Consumer Media & FourFourTwo is part of Haymarket Sport
| International Licensing | © Haymarket Media Group 2010