Arsenal suffered their first Premier League defeat of the season, losing 2-0 to Bournemouth after defender William Saliba was sent off in the 30th minute for a last-man foul on Evanilson. Initially, Saliba received a yellow card, but after a VAR review, it was upgraded to a red for denying a clear goal-scoring opportunity, allowing Bournemouth to capitalize with goals from Ryan Christie and Justin Kluivert. Arsenal, missing key players like Bukayo Saka and Martin Odegaard due to injuries, struggled to recover from the setback. Saliba's red card is the first in his senior career and will sideline him for Arsenal's upcoming match against Liverpool, though he will be available for the UEFA Champions League fixture against Shakhtar Donetsk. This defeat ends Arsenal's unbeaten start and raises concerns about their discipline, having received three red cards in seven league games this season.