Arsenal boss Mikel Arteta is waiting on the fitness of Pierre-Emerick Aubameyang and Martin Odegaard before their Europa League quarter-final second leg at Slavia Prague.
However, the Gunners have been boosted by the availability of Bukayo Saka and Emile Smith Rowe.
The Gunners travel to Prague with the tie at 1-1 after Tomas Holes' late equaliser at the Emirates last week.
With Arteta's side ninth in the Premier League, winning the Europa League offers their best route back into Europe next season.
Asked if Aubameyang and Odegaard would train on Wednesday after having missed Tuesday's session, the Spaniard replied: "I don't know, we have to see how they are.