Chelsea FC produced a stunning second-half comeback to defeat Leeds United 6-3 in the Carabao Cup third round on Tuesday night. Trailing 2-0 at the break at Stamford Bridge, a quartet of half-time substitutes transformed the game and booked the Blues' place in the fourth round.

Head coach Xabi Alonso, who made nine changes to his starting line-up, admitted he was at fault for the poor first-half display. "I need to take my own blame and my own responsibility on the things that happen," Alonso told BBC Sport Football after the match. The result keeps alive a potential route to silverware for a Chelsea side not competing in European football this season, and they currently sit fourth in the Premier League with six points from three games.

What changed the game for Chelsea?

Alonso's decision to make four substitutions at the interval proved decisive. He introduced Cole Palmer, Morgan Rogers, Pedro Neto, and Reece James, completely altering the momentum. Palmer scored twice, Neto added another, and Rogers was involved in four goals from open play as Chelsea ran riot. The introductions came after a disjointed first 45 minutes where goals from Leeds's Tarik Muharemovic and Brenden Aaronson, who also made eight changes, had put the visitors in control.

Youngsters Estevao Willian and Jamie Gittens were withdrawn at the break, while 16-year-old debutant Reggie Watson, who was booked, also made way. The experienced core brought on settled the team and exploited the spaces Leeds left as they chased the game. This competitive fixture was vital for squad engagement, given Alonso manages a 27-man group with a strong academy pipeline.

How does this affect Chelsea's season?

Progressing in the Carabao Cup is significant for Chelsea's ambitions this term. With no European distractions, domestic cup competitions offer a clear path to trophies. The comeback also demonstrated the squad's depth, though Alonso refused to draw a cynical line between star names and back-up options. "I know that probably I have to take the right decisions for them to show their best level," he said.

The win provides a positive mood ahead of Chelsea's next Premier League fixture, a home match against Newcastle United on January 2nd. You can view the full upcoming schedule on the club's fixtures page. The team has scored eight goals and conceded seven in the league so far, leaving them three points behind leaders Manchester City.

Who was missing from the squad?

While the substitutes shone, some notable players were absent from the matchday squad. The club's £40m summer signing Geovany Quenda, who joined from Sporting, watched from the bench and was not used. Also, Chelsea are currently without several key players due to injury, including Jordan Henderson, Marco Palestra, and Moisés Caicedo, as listed on the club's injuries page.

This context makes the contributions from players like the 35-year-old Danny Welbeck, who scored twice, and Valentin Barco, who netted the fifth, even more valuable. The result ensures Chelsea's season retains multiple fronts for competition as they aim to close the gap at the top of the standings. The team's next challenge is to prepare for Newcastle's visit to Stamford Bridge in the new year.