Denilson will pull on an Arsenal shirt for the first time since September 12 tonight.
The Brazilian midfielder will start against Standard Liege after missing 14 first-team games with a back injury.
Denilson is one of five changes from the side which lined up at Sunderland on Saturday.
Carlos Vela has been given his chance up front while Andrey Arshavin, Emmanuel Eboue and Kieran Gibbs return to the side.
Arsenal team: Almunia; Eboue, Gallas, Vermaelen, Gibbs; Song, Fabregas, Denilson; Nasri, Vela, Arshavin. Subs: Mannone, Sagna, Rosicky, Eduardo, Walcott, Silvestre, TraoreCopyright 2016 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