Arsenal manager Mikel Arteta has said his team "cannot continue to play with 10 men" in the wake of William Saliba's red card at Bournemouth.
The France centre-back was sent off in the first half against the Cherries and the Gunners went on to lose 2-0 - their first defeat of the Premier League campaign.
He is the third Arsenal player to be sent off this season following the dismissals of midfielder Declan Rice against Brighton and forward Leandro Trossard in the draw at Manchester City.
"Playing with 10 men, always there is an issue," said Arteta, whose side have conceded goals in all three games in which they have been reduced to 10 men.