Arsenal lacked concentration in their 3-2 loss to Southampton, Nigeria midfielder Alex Iwobi admitted.
Unai Emery's men struggled to match the Saints and lost their first competitive match since August [vs. Chelsea] ending a run of 22 games without defeat.
Henrikh Mkhitaryan's brace was not enough to save the Gunners at St Mary's Stadium as Danny Ings' double and Charlie Austin's late winner denied them victory.
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The 22-year-old, who was on parade for 70 minutes, noted his side's defensive lapses and has urged his teammates to pick themselves up ahead of Tuesday's League Cup game against archrivals Tottenham Hotspur.