Chelsea FC have completed the signing of goalkeeper Emiliano Martinez from Aston Villa for £7.5 million, but immediate defensive frailties were exposed in his debut. The 33-year-old World Cup winner started in a 4-3 victory over Brighton, a match where Chelsea conceded three times and recorded just 25.9% possession, as reported by BBC Sport Football this week.

Despite the chaotic win, Chelsea sit 3rd in the Premier League with six points from two games, having scored seven goals and conceded five. Their next test is a trip to face 9th-placed Arsenal on September 6th, a fixture detailed on our fixtures page. The club currently has several players sidelined, including Jordan Henderson, Enzo Fernández, and Marco Palestra, as listed on the injuries page.

Why did Chelsea sign Emiliano Martinez?

Manager Xabi Alonso moved quickly to bring in the experienced Argentine, a two-time FIFA Best Goalkeeper award winner. Martinez, who helped Argentina win the 2022 World Cup and Aston Villa lift the Europa League in May, was thrust straight into the starting lineup. "I am happy with his first impact," Alonso said after the Brighton match. The goalkeeper also spoke with Chelsea legends Petr Cech and John Terry, from whom he sought permission to wear the number 26 shirt.

Former goalkeeper Shay Given described the move as a "brilliant signing." Given told the BBC, "Martinez is interesting. He's only just signed but Alonso's thought 'I'm not messing about, I'm getting him straight in the team'." The arrival signals a major shift in the goalkeeping hierarchy, with previous first-choice Robert Sanchez falling to fourth choice at Stamford Bridge.

What are Chelsea's defensive problems?

The victory over Brighton papered over significant cracks. Chelsea have now gone 18 consecutive games without a clean sheet. Their defensive issues were clear from the opening day, when Sanchez was at fault for the first goal in a 3-2 win at Fulham. Against Brighton, the centre-back trio of Wesley Fofana, Maxence Lacroix, and Levi Colwill looked vulnerable at times.

The team's statistical performance was alarming. They completed only 146 passes, a club record low since the 2003-04 season, and their possession figure of 25.9% was the lowest recorded under Alonso. The manager has switched to a back three this season after primarily using a back four last term, but the new system is yet to solidify.

What does this mean for the rest of the squad?

The signing of Martinez and the demotion of Sanchez, a £25m signing from Brighton in 2023, shows Alonso is not afraid of tough decisions. "We will see. Sometimes you have to take tough decisions," the manager stated. Sanchez, who had not won major silverware before his move, was temporarily dropped last season for Djordje Petrovic and Filip Jorgensen before regaining his place under the faith of goalkeeping coach Ben Roberts.

Midfield is another area of concern. With Moises Caicedo's fitness a worry, Malo Gusto and Romeo Lavia started in central midfield against Brighton. Youngster Valentin Barco was not yet trusted to start a Premier League match. The club's activity may not be over, as they are exploring a move for Monaco's Lamine Camara and are expected to bid for Enzo Fernandez before Tuesday's transfer deadline.

Where does Chelsea go from here?

The immediate focus is on shoring up the defence ahead of the clash with Arsenal. The team's current +2 goal difference, visible in the league standings, highlights the imbalance between a potent attack and a leaky back line. Martinez's winning mentality is a clear asset, but as he acknowledged after his debut, "A win is a win, I know it wasn't a perfect game. But in the end, winning and moving on is what we need."

Alonso will need more than a new goalkeeper to turn his team into genuine title challengers. The defensive unit must improve quickly, and the potential arrival of further reinforcements before the deadline could be key. For now, Chelsea's perfect record is intact, but the underlying numbers suggest significant work is required.