Vitoria, meanwhile, have lost their opening two fixtures in Group F without scoring a goal.
Here, Sports Mole rounds up the latest injury and suspension news for the Gunners ahead of Thursday's game.
Type of injury: Knee
Possible return date: November 23 (vs. Southampton)
Nelson withdrew from the England Under-21 squad during the recent international break with a knee injury and he is expected to be out of action for at least a further month.
ARSENAL'S SUSPENSION LIST
Arsenal have no players suspended for the fixture on Thursday evening.