William Saliba's absence presents a significant defensive challenge for Arsenal, requiring manager Mikel Arteta to implement a robust plan for October. The team faces a demanding schedule, including matches against Leeds, Lille, Nottingham Forest, Bayern Munich, and Everton. Arteta must focus on creating reliable defensive combinations, ensuring collective protection, and a clear rotation strategy, rather than solely finding a replacement for Gabriel. Reports suggest Saliba's return might not be until December, making any anticipation of an early comeback premature. The upcoming Champions League fixtures against Lille and Bayern Munich will particularly test the squad's depth and tactical adjustments. Arteta's immediate task is to ensure the available defenders operate as a cohesive and dependable unit to navigate this critical period.