Arsenal manager Mikel Arteta hailed the impact of Mohamed Elneny and the rest of the substitutes following their 3-1 over Olympiacos on Thursday evening.
The Gunners took the lead in the 34th minute when Martin Odegaard’s beauty beat goalkeeper Jose Sa.
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In the 58th minute, Morocco international Youssef El Arabi levelled matters for the Greek Super League side, before the English team took the lead with 10 minutes left to play courtesy of Gabriel.