Martinez arrived at Stamford Bridge with a reputation as a big-game performer, but his 4-3 debut win over Brighton underlined a stark reality for Xabi Alonso: shoring up the goalkeeping position alone will not transform Chelsea into genuine Premier League title contenders.


Martinez Makes Instant Impact, But Defence Still Leaks

Confirmed just hours before kick-off, Martinez was thrust straight into the starting XI and showed no signs of rust, despite completing only one training session with his new team-mates. The 33-year-old Argentina World Cup winner was not at fault for any of Brighton’s three goals, a marked improvement on Robert Sanchez, who had been directly responsible for at least two goals in the 3-2 win at Fulham earlier in the week.


Even so, Chelsea have now conceded five goals in their opening two league matches and have gone 18 games without a clean sheet, their longest such run since the 1960s. Martinez himself acknowledged the issue post-match: “A win is a win… The front three is amazing. When we go forward, we can hurt teams… At the back, we need to bring the goals down.”


Underlying Numbers Favour Martinez Over Sanchez

Statistically, Martinez brings a higher ceiling than Sanchez. The former Aston Villa and Europa League winner posted stronger underlying metrics last season: fewer goals conceded, a higher save percentage, better shot-stopping relative to expected goals, and significantly superior passing accuracy. By contrast, Sanchez, once backed publicly by Alonso and senior club figures, has been prone to high-profile errors and now finds himself fourth in the goalkeeping pecking order and available for transfer.


Alonso praised Martinez’s immediate influence: “He has been in the building for 48 hours… he has this charisma, this aura to influence and to have a very positive connection with the rest of the team.”


Possession Woes and Midfield Fragility Expose Bigger Issues

The bigger concern for Chelsea lies in their inability to control matches. Against Brighton, they recorded just 25.6% possession and completed only 146 passes, the lowest figures in a Premier League game in the club’s recorded history (since 2003-04). Alonso downplayed the statistic, insisting context matters more than raw percentages, but the pattern is hard to ignore.


Much of this stems from midfield instability. Enzo Fernandez was omitted for the second consecutive match, with Manchester City expected to table a bid exceeding £120m before the transfer deadline. In his absence, Chelsea started Malo Gusto and Romeo Lavia in central roles, while Moises Caicedo came off injured after just 11 minutes as a substitute and Jordan Henderson remained unavailable.


With Fernandez likely to depart, Chelsea have moved quickly to line up a replacement. Reports indicate an agreement in principle to sign Monaco’s Lamine Camara for around €45m (£38.5–39m), though the Senegal international is viewed as a more dynamic ball-winner rather than a like-for-like deep-lying playmaker.


Defensive Shape and Set-Piece Vulnerability

Alonso’s switch to a back three, after largely using a back four last season, has left centre-backs Wesley Fofana, Maxence Lacroix and Levi Colwill exposed at times, particularly from set-pieces and transitions. Brighton’s fightback from 3-0 down highlighted how easily Chelsea can be stretched when their midfield shield is thin or disjointed.


Ex-Premier League goalkeeper Shay Given described Martinez as a “brilliant signing” and noted Alonso’s willingness to install an experienced leader immediately. Yet Given also implied that individual quality at the back will not be enough if the structure in front remains porous.


Attack Fires, But Balance Is Key

There is no questioning Chelsea’s attacking output: seven goals in two games, with Cole Palmer, Joao Pedro, Noni Madueke and others looking lethal in transition. Martinez summed it up: “I know the talent we have up front. I try to bring that solidity in the back.”


For Chelsea to evolve from an entertaining, high-scoring side into authentic title challengers, Alonso must find a way to combine that firepower with greater control, midfield protection and defensive organisation. A world-class goalkeeper helps, but it is only one piece of a much larger puzzle.