Chelsea were punished for a profligate showing at Borussia Dortmund after Karim Adeyemi's second-half strike secured a slender 1-0 lead in the Champions League last 16.
Graham Potter's side will have home advantage in the return match at Stamford Bridge on March 7 but left Signal Iduna Park ruing missed chances on Wednesday.
Joao Felix spurned a pair of glorious first-half opportunities in an entertaining encounter in Germany, before Adeyemi's 63rd-minute goal inflicted further misery on Chelsea after a ruthless counter-attack.
The Blues still have the chance to turn the tie on its head, but Potter and his men cannot afford similar struggles in front of goal in the second leg in west London.
Thiago Silva had the ball in the back of the net after 16 minutes, only to see the goal ruled out and the centre-back cautioned for a seemingly intentional handball past Gregor Kobel.
Chances continued to flow in a frenetic first half as Marius Wolf sliced a golden opportunity wide and Sebastien Haller fired narrowly off target from a presentable opening.
Joao Felix wastefully blazed over before hitting the crossbar after a driving run, while Wolf arrowed just wide with Kepa Arrizabalaga scrambling.
Kobel produced an expert stop to deny Reece James' pinpoint free-kick after the interval, before the Dortmund goalkeeper thwarted a bouncing volley from the England right-back soon after.
Adeyemi was clinical when Dortmund broke from the resulting corner, released by Raphael Guerreiro and powering past Enzo Fernandez before rounding Kepa to score.
Emre Can then cleared off the line after Kalidou Koulibaly's effort squirmed under Kobel, who kept Dortmund's narrow lead intact with a fine stop from Fernandez in the final minute.
What does it mean? Advantage Dortmund
Dortmund defeated an English side in European competition for the first time in 11 attempts, although their first such victory since March 2016 – against Tottenham – came with a degree of fortune.
Potter will wonder what his Chelsea side must do to get past Kobel in the return meeting after Joao Felix's pair of misses came back to haunt the Blues on the road.
A repeat performance at home may be enough to down Dortmund, but Potter's men cannot bank on having such a plethora of chances again as they stare down the barrel of an early European exit.
Adeyemi the difference
While the brilliant Brandt created four chances in a productive display, Adeyemi will steal the headlines for his remarkable goal on the break.
The 21-year-old has scored in each of his last three competitive appearances – one more than in his first 20 games for BVB.
Havertz's Dortmund wait goes on
Kai Havertz has repeatedly been trusted by Potter to lead Chelsea's line, but the Germany international suffered a familiar fate against BVB.
The forward managed to create four chances and also attempted four shots, but he has now played eight games against Dortmund without scoring – more than against any other opponent in his club career. He has lost all five away games against Dortmund.
What's next?
Chelsea return to Premier League action at home to Southampton on Saturday, while Dortmund host Hertha Berlin the following day in the Bundesliga.
Maresca thrilled with 'serious' Chelsea after Conference League romp
Enzo Maresca was thrilled with the "serious" performance Chelsea put in during their 8-0 drubbing of Armenian minnows Noah in the Europa Conference League.
Joao Felix and Christopher Nkunku scored twice at Stamford Bridge, while Tosin Adarabioyo, Marc Guiu, Axel Disasi and Mykhailo Mudryk also got themselves on the scoresheet.
The Blues were six goals to the good by half-time, the biggest advantage by an English side at the break of a major European game since Derby County were winning 9-0 against Finn Harps in the 1976-77 UEFA Cup.
Chelsea are also top of the 36-team league table on goal difference, having scored 16 times in their three matches in the competition so far.
Maresca was impressed by the way his side ensured there was no slacking against evidently inferior opposition.
"I think the players showed how professional and serious they are. It is very easy to sleep in these kind of games," Maresca said after the game.
"Football is full of surprises. It was to show how serious we are, how professional. They showed that and it's an important message for all of us.
"In the first five minutes, we conceded a chance. You have to be focused. The way to show respect to them, don't underestimate them.
"Football is full of these kind of surprises. We don't need that."
Speaking to TNT Sports, Maresca was especially pleased considering he once again made wholesale changes from the side ordinarily seen in the Premier League.
"Very impressed, especially because we are trying to change players every game. It works well," he added.
"We have good players, and we want them to get minutes. Some of them play in the conference, some in the Premier League, but all of them want to play every game."
The Stamford Bridge faithful could be heard chanting 'we want 10' during the game, but centre-back Adarabioyo was equally delighted with the clean sheet.
"I didn't [know fans were chanting 'we want 10']. Didn't manage 10 but a great result," he told TNT Sports.
"Concentration is key to make sure we have the clean sheet at the end of the game and we managed to do so. I've been thinking I needed a goal soon, so very happy to get one.
"Never take your foot off the gas. We just kept going. Set out for the clean sheet and we managed to get that. We haven't had one for a while."
Up next for Chelsea is a return to Premier League action, hoping to carry the momentum for their convincing triumph against an out of sorts Arsenal at Stamford Bridge on Sunday.
Chelsea 8-0 Noah: Ruthless Blues stay perfect after first-half rout
Chelsea continued their quest for the knockout stages of the Europa Conference League by hammering Noah 8-0 on Thursday.
Enzo Maresca's side are one of six sides still with a perfect record in the competition, but sit top of the pile with their superior goal difference following their Stamford Bridge mauling.
Tosin Adarabioyo headed the hosts into a 12th minute lead before Marc Guiu capitalised on Goncalo Silva's loose pass 84 seconds later to double their advantage.
Chelsea notched their third from another corner, this time through Axel Disasi, with another defensive error punished by Joao Felix's deft finish over Ognjen Cancarevic.
Mykhailo Mudryk then netted the pick of the first-half goals with a curled effort into the top corner, with Felix grabbing his brace four minutes before the interval.
It then took Chelsea 24 minutes to get their seventh. Christopher Nkunku saw his initial effort saved by Cancarevic but was able to squeeze in the rebound at the near post.
Yan Eteki then fouled Kiernan Dewsbury-Hall in the box, with a penalty given after a VAR review. Nkunku stepped up and smashed the ball down the middle for his fifth goal of the competition this season.
Data Debrief: Blues sink Noah's Ark
Chelsea are on a roll in the Europa Conference League and have now scored 16 goals in their three games in the competition so far.
Six of those came in the first half, with their 6-0 advantage at the interval the biggest by an English side at the break of a major European game since Derby County were winning 9-0 against Finn Harps in the 1976-77 UEFA Cup.
The Blues ended the contest with a whopping 5.44 expected goals (xG) from their 31 shots, compared to Noah's 0.61 from their 15 attempts on Filip Jorgensen's net.
The Numbers Game: Can Chelsea dent title hopes of misfiring Gunners?
Ten matches into the Premier League season, Arsenal's hopes of ending their long wait for a league title are already in danger.
Last week's 1-0 defeat to Newcastle United made it just seven points from five games, and they now trail leaders Liverpool by seven points.
Injuries and suspensions have taken their toll on Arteta's men, and things do not get much easier for them on Sunday, against a Chelsea team currently above them on goal difference.
Enzo Maresca's Blues fought back to draw 1-1 with Manchester United last time out, and only Manchester City and Liverpool have beaten them since the Italian took over.
We delve into the Opta data to preview Sunday's headline fixture at Stamford Bridge.
What's expected?
Given the two sides are only separated on goal difference ahead of Sunday's match, the Opta supercomputer finds it difficult to split.
Across 10,000 pre-match simulations conducted by the supercomputer, Arsenal were victorious in 41.2%, giving them a slight edge over their hosts, who are a 33.2% shot.
The likelihood of a draw is rated at 25.6%, but you sense Arsenal need to take all three points after seeing their hopes of winning the title drop to 4.4% in Opta's season predictions. Chelsea's own hopes are rated at 0.3%, with City (61.9%) still clear favourites ahead of Liverpool (33.4%).
Chelsea have won just one of their last nine Premier League games against Arsenal (two draws, six defeats), a 2-0 away win in August 2021. The Gunners have managed three victories in their last four league trips to Stamford Bridge (one draw) – as many victories as they recorded in their previous 20 visits (seven draws, 10 defeats).
Arsenal have also won their last six Premier League London derby matches by an aggregate score of 22-3, winning six of those matches by five or more goals.
One such occasion was a 5-0 rout of Chelsea at the Emirates Stadium last April, their biggest-ever margin of victory against the Blues in all competitions.
Blues eye statement victory
When the Premier League fixture list was drawn up, even the most optimistic Chelsea fan may have struggled to visualise the Blues sitting ahead of Arsenal in the table after 10 games.
But Maresca's side have shown promising signs in the early stages of his tenure. Chelsea's last two Premier League defeats this season have come against last season's top three teams – 0-5 versus Arsenal in April, 0-2 versus City in August and 1-2 against Liverpool in October.
They are unbeaten in their last 21 matches against all other teams, winning 14 and drawing seven while scoring 57 goals in total across those games.
The future looks bright for Chelsea, who fielded a starting lineup with an average age of 23 years and 96 days at Old Trafford last week – their youngest-ever XI for a Premier League match against Manchester United.
However, they are still waiting on a first statement win under Maresca, and getting one over on the Gunners would earn him plenty of goodwill among the fans.
Their chances could be decided by the fitness of Cole Palmer, who is an injury doubt after suffering a knock against United.
He opened the scoring when the Blues last welcomed Arsenal to west London for a 2-2 draw last October, scoring his first Premier League goal at Stamford Bridge.
Since then, he has more home goals in the competition than any other player (21), also leading the way for goal involvements (12 – seven goals, five assists, alongside Mohamed Salah) and open-play chances created in 2024-25.
Can fit-again Odegaard get Gunners firing?
Last season, Arsenal won 42 of their 89 Premier League points on their travels, taking nine points from five matches at the homes of their Big Six rivals.
This campaign, however, their failure to hit top form on the road has threatened to end their latest title tilt before it truly got going.
Arsenal have collected seven points from five away matches this term, the same amount as Brighton and fewer than Liverpool (13), Nottingham Forest (11), Chelsea, City and Aston Villa (all 10).
While Arteta has long preached the importance of control, Arsenal have simply not been good enough going forward in those matches. They have attempted just 37 shots on the road in the Premier League this season (7.4 per game), with only Brentford (seven) averaging fewer per away match across the entire division.
The fact Arsenal played significant amounts of time at Manchester City and Bournemouth with a numerical disadvantage likely plays a part, but the fact five teams have attempted at least twice as many shots on the road does not make for good reading (Manchester City 90, Tottenham 83, Crystal Palace 79, Bournemouth 78 and Manchester United 74).
Martin Odegaard's return to training after two months out with an ankle injury is a major boost, with the Norwegian having led all players in the Premier League for expected assists (11.17 xA) and chances created from open play (88) last season.
Arsenal have actually outperformed their underlying attacking metrics this campaign, netting 17 league goals from 15.75 expected goals (xG), so their finishing does not appear to be an issue. The fact they rank eighth in the league for xG does, however, suggest chance creation is a problem.
Arteta will hope Odegaard's return can make the difference, or a title challenge may prove a bridge too far. The last time they lost three successive away Premier League games was in December 2021, and they went on to miss out on a top-four finish that season.
The Norwegian was a late substitute as they were beaten 1-0 by Inter in the Champions League on Wednesday. They have now lost three of their last six games in all competitions, as many as their previous 32 beforehand.
PLAYERS TO WATCH
Chelsea – Nicolas Jackson
Since the start of last season, Chelsea striker Jackson has been involved in more London derby goals than any other player in the Premier League (10 goals, two assists).
All of his 12 involvements have come in his last nine such appearances, and he already has six Premier League goals this term.
Arsenal – Bukayo Saka
Saka has provided more assists than any other player in the Premier League this season (seven).
He has also either scored (once) or assisted (twice) a goal in each of his last three away games against Chelsea in the Premier League, with Sergio Aguero (2013 to 2017) and Javier Hernandez (2012 to 2018) the only visiting players to do so in four consecutive appearances.
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