Arsenal manager Mikel Arteta said he did not start Pierre-Emerick Aubameyang in their 1-1 draw with Slavia Prague because of other players "who had the best chance".
Aubameyang was dropped to the bench at the Emirates Stadium as the Gunners were held in the first-leg of their Uefa Europa League quarter-final tie.
The Gabon striker was later introduced in the 78th minute alongside Egypt's Mohamed Elneny and goalscorer Nicolas Pepe.
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Eight minutes after their introduction, Pepe broke the deadlock following an assist from Aubameyang but Arsenal suffered a late equaliser with Tomas Holes’ header in the stoppage-time.