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).
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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.
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