Arsenal are without five first-team regulars for the Champions League trip to Porto.
Defender William Gallas (back), midfielder Alex Song (knee) and Andrey Arshavin (hamstring) were all absent from the 18-man squad which left Luton Airport on Tuesday afternoon, as were goalkeeper Manuel Almunia and striker Eduardo (hamstring).
Veteran former captain Sol Campbell could be set for a first European appearance for the Gunners since the 2006 Champions League final defeat by Barcelona in Paris, while forward Carlos Vela returns from a knee injury.
Manager Arsene Wenger, when asked if Campbell would play, told Sky Sports News: "It's a possibility that I don't rule out at the moment because if he does not play it means two left-footed players in that position (Thomas Vermaelen and Mikael Silvestre).
"It would mean he can show his signing was worth doing and he can help us in going through to the last eight."
Speaking about Almunia, Wenger added: "Almunia already had a twisted finger and made it worse and I did not want to take a risk."
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