Arsenal manager Mikel Arteta will wait and see if Pierre-Emerick Aubameyang and Martin Odegaard are fit enough to face Slavia Prague.
Both players have travelled to Prague, with the Europa League quarter-final tie poised at 1-1.
Asked if both players would train on Wednesday, Arteta said: "Depending on how they wake up! If they wake up better, yes.
"Yesterday, neither of them could train. Hopefully today. It's a sunnier day, so maybe it's better!"
And if they would feature against Slavia, Arteta added: "I don't know, we have to see how they are today.
"We still have a couple of other ones in the last few days, so we will have to see how everybody is today and after training, how they react for tomorrow's game."