Arsene Wenger insists Danny Welbeck did not suffer a recurrence of his recent injury despite coming off at half-time as Arsenal lost to Cologne.
The Gunners, showing 11 changes from Saturday's north London derby success over Tottenham, were beaten 1-0 in a poor contest at the RheinEnergieStadion.
A controversial second-half penalty settled the tie as Mathieu Debuchy was adjudged to have fouled Sehrou Guirassy in the area when there was minimal contact.
Guirassy stepped up to convert the resulting spot-kick and give Cologne the three points which keeps them in the hunt to go through with Arsenal in second place.