Martinez's debut highlights Chelsea's ongoing defensive struggles

Emiliano Martinez made his Chelsea debut in a 4-3 win over Brighton, but the team conceded three goals. The goalkeeper was not at fault for any of them, yet Chelsea have now let in five goals in two matches. Manager Xabi Alonso must fix the defence to mount a title challenge.
Martinez joined Chelsea for £7.5m from Aston Villa, with his signing confirmed just hours before kickoff. He had completed only one full training session with his new teammates before being thrust into the starting lineup. The goalkeeper previously helped Argentina win the 2022 World Cup and guided Aston Villa to Europa League glory in May.
Chelsea have conceded five goals across their opening two matches despite winning both. Robert Sanchez, who started the season opener at Fulham, was blamed for at least one goal and has now dropped to fourth in the goalkeeping pecking order. Chelsea face Arsenal next, with manager Xabi Alonso needing to address defensive frailties.
This story may resonate with Chelsea supporters and Premier League followers who could see the team's defensive issues as a recurring pattern rather than a quick fix. The goalkeeper change may provide short-term stability, but the underlying defensive structure could determine whether Chelsea genuinely contend for the title. Other clubs may also take note of how quickly Chelsea moved to replace an error-prone starter, potentially influencing transfer market expectations.