London, Oct 2
Gabriel Martinelli scored early to set Arsenal on course for a 2-0 win over Olympiacos, maintaining the Premier League side's perfect start in the UEFA Champions League group stage.
Martinelli reacted quickest in the 12th minute after Viktor Gyokeres' shot was saved by Konstantinos Tzolakis and deflected onto the post. The Brazilian forward also had a goal and an assist in Arsenal's opening win over Athletic Club.
Arsenal manager Mikel Arteta rotated heavily, making six changes from the weekend victory over Newcastle.
Olympiacos threatened an equaliser as Daniel Podence forced David Raya into a strong save and Francisco Chiquinho had a goal disallowed for offside.
Martin Odegaard was denied by Tzolakis before substitute Bukayo Saka sealed the win in stoppage time, his low shot slipping through the goalkeeper's legs.