Brighton come from behind to beat 10-man Chelsea
At a glance
Danny Welbeck scores two as Fabian Hurzeler's substitutes win it late
Chelsea defender Trevoh Chalobah sent off
Smattering of boos at full-time for hosts
Brighton came from behind to beat an ill-disciplined Chelsea side who had a player sent off for the second Saturday running.
Substitutes Danny Welbeck and Maxim de Cuyper scored during 11 minutes of added time as the visitors profited from Trevoh Chalobah's 53rd-minute red card.
The Blues had been coasting to victory in the first half when Enzo Fernandez headed in Reece James's cross, via a deflection off Brighton winger Kaoru Mitoma.
However, Mitoma played a key role in the game's big turning point - as he won possession from Chelsea's Andrey Santos, on his first Premier League start, leading to Chalobah's desperate challenge on Georginio Rutter.
After a lengthy video assistant referee check, Chalobah was dismissed - seven days after goalkeeper Robert Sanchez was sent off early in their 2-1 defeat at Manchester United.
And Welbeck benefited by scoring twice - getting his first, shortly after coming on, by heading in the equaliser at the far post in the 77th minute.
De Cuyper then headed Brighton in front from a corner in the second minute of stoppage time - before Welbeck finished from close range to seal victory in the ninth.
Chelsea, who drop to seventh place, left the field to a smattering of boos. They have not won a Premier League match since the international break, with Liverpool next to visit west London.
Meanwhile, Brighton rise into to 10th place after another positive result against big six opposition.
Chelsea analysis: Costly mistakes keep coming
Costly mistakes and red cards make up the story for Chelsea at the moment.
Midfielder Santos was the prime culprit - as Chalobah paid for trying and failing to clean up his team-mate's error.
The Brazilian midfielder is inexperienced, and that's the risk Chelsea are taking carrying the youngest squad in the Premier League.
Regardless, head coach Enzo Maresca will need to help his team cut out the mistakes and the ill-discipline, and improve results after just one win in five in all competitions.
That solitary win was an unconvincing 2-1 victory at League One side Lincoln City in the Carabao Cup.
That match aside, Chelsea gave away a last-minute equaliser through poor marking at Brentford. At Bayern Munich, the Blues played well but gave away cheap goals against an experienced Champions League side. In the past two league matches, against Manchester United and Brighton, sendings off have cost them.
The issues at Stamford Bridge are worsened by a selection crisis, with Maresca now without his four favoured centre-backs, as well as star attacker Cole Palmer for the next match against champions Liverpool.
Wesley Fofana, Tosin Adarabioyo and Levi Colwill are all injured until after the international break and Chalobah is now suspended.
Chelsea's Maresca reacts to defeat against Brighton
Brighton analysis: Will Minteh be their next superstar?
There is an argument that Marc Cucurella is one of the best defensive left-backs in the league but Yankuba Minteh gave him plenty of headaches over 90 minutes.
His power, speed and skill causes Cucurella all sorts of trouble - and ultimately led to Welbeck's equaliser.
Minteh's whipped cross for Welbeck broke down Chelsea in the 77th minute - after Maresca had tried to shore up his 10-man side by throwing on defenders Benoit Badiashile, Malo Gusto and Josh Acheampong - along with defensive midfielder Romeo Lavia.
It started a sweet comeback for Brighton - who have sold more than £260m worth of players and staff to Chelsea since Todd Boehly and Clearlake Capital bought the Londoners in 2022.
Seagulls owner Tony Bloom's recruitment set-up continues to unearth talents capable of competing against teams such as Chelsea. Even when Chelsea keep taking their best players.
Asked whether the results will mean Chelsea sign more of his players, Hurzeler replied: "I have to talk with Tony. We should avoid the changes!
"It's football. You have to accept it. That's the normal business - so it's more about finding solutions and getting results."
The Austrian manager also deserves credit for his substitutions - bring on not just Welbeck and De Cuyper to scored the goals, but Mats Wieffer and Brajan Gruda to provide assists.
However, the next Brighton talent to become a target for the top clubs could well be their unplayable winger Minteh.
'The small margins were in our favour today' - Hurzeler
Player of the match
After the opportunity to rate players has closed, the score displayed represents the average from all the submissions by BBC Sport users.