Attack – Pepe, Aubameyang, Willian
Pierre-Emerick Aubameyang is set to come straight back into the side following his exile on Sunday.
Arteta says the disciplinary matter has been resolved, so the Gabon star should lead the line tonight in place of Alexandre Lacazette.
Nicolas Pepe and Willian are likely to come into the side on either flank.
Bukayo Saka is a slight doubt following a hamstring strain suffered in the first half against Tottenham.
Arsenal expected XI vs Olympiacos in full: Leno; Bellerin, Holding, Mari, Tierney; Elneny, Xhaka; Pepe, Smith Rowe, Willian; Aubameyang.