Gabriel Martinelli and Leandro Trossard came off the bench to earn Arsenal a 2-0 Champions League win over Athletic Club in Bilbao.

Mikel Arteta's side struggled to fashion clear openings for much of the contest but, once summer signings Viktor Gyokeres and Eberechi Eze departed, Martinelli latched onto a ball over the top by Trossard in the 72nd minute to find the breakthrough goal 36 seconds after coming on.

Martinelli then returned the favour for Trossard soon after to seal the victory, the Belgian's deflected strike leaving goalkeeper Unai Simon helpless to keep it out. In a keenly-fought contest, the cutting edge of the Arsenal substitutes made the difference.

The Gunners, who were beaten in the semi-finals of the competition last season by eventual winners Paris Saint-Germain, wer

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