By Chris Harris

Vito Mannone or Wojciech Szczesny will make their Champions League debut on Wednesday night after Manuel Almunia was ruled out of Arsenal's clash with Standard Liege.

The Spanish goalkeeper is suffering from a chest infection and has not travelled to Belgium. Neither have Robin van Persie and Denilson, both of whom sustained injuries during Saturday's 4-2 defeat at Manchester City. However they have a chance of returning for this weekend's Premier League clash with Wigan.

"Manuel Almunia is sick so he will not be with us," revealed Wenger before flying out with his 18-man squad.

"From Saturday we lost Robin van Persie with a knee problem but it is a question of days for him [until he is fit]. As for Denilson, I took him off on Saturday for a back problem. It is a question of days again for him."

Theo Walcott will not return for the group stage opener but Sanchez Watt has been named in the squad. The 18-year-old forward impressed at the Emirates Cup in August and could make his competitive debut on Wednesday.

Arsenal are still without Samir Nasri (leg), Andrey Arshavin (groin), Lukasz Fabianski, Johan Djourou (both knee) and Carlos Vela (ankle).

Arsenal squad:

Vito Mannone
Wojciech Szczesny
Bacary Sagna
Gael Clichy
William Gallas
Thomas Vermaelen
Mikael Silvestre
Kieran Gibbs
Emmanuel Eboue
Alex Song
Cesc Fabregas
Abou Diaby
Aaron Ramsey
Tomas Rosicky
Jack Wilshere
Nicklas Bendtner
Eduardo
Sanchez Watt

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 15 Sep 2009