Arsenal were denied a "clear penalty" in their 1-0 defeat to Sheffield United and did not deserve to lose the match, according to boss Unai Emery.
Lys Mousset scored the only goal in Monday's Premier League clash at Bramall Lane to earn the hosts a famous victory on his first league start.
The 23-year-old profited from some slack defending from a corner to punish Arsenal, who had previously gone eight matches unbeaten in all competitions.
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Defeat for Arsenal cost them the chance to move up to third in the table, but Emery felt his side were denied an obvious penalty for John Egan's shirt pull on Sokratis inside the opening seven minutes.