Arsenal began their Champions League campaign with a 2-0 win away to Athletic Bilbao on Tuesday, with Gabriel Martinelli making an immediate impact from the bench to open the scoring and another substitute, Leandro Trossard, netting the second.
Martinelli replaced Eberechi Eze in the 71st minute, with Arsenal struggling to find a breakthrough despite creating plenty of chances, and the substitute netted an impressive solo goal after less than a
