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Tuesday, November 4th
20:23 CET - Napoli are running out of time in their quest to get their second Champions League win of the season, with Frankfurt holding firm in Italy.
20:18 CET - Arsenal have made it 3-0 in Prague to wrap up the three points.
Despite some Slavia pressure, Arsenal have their third of the night through Mikel Merino. Home goalkeeper Jakub Markovic misjudges the flight of a lofted pass, opting to catch rather than punch, and it lands straight onto the Spaniard's head. He doesn't know too much about it, but the ball ends up in the back of the net. The Gunners look home and hosed.
Josh Donaldson from Fortuna Arena
20:07 CET - Over in Paris, Ousmane Dembele is making his first Champions League start of the season, with both PSG and Bayern close to full strength.
19:57 CET - It's 2-0 in Prague!
Who needs Viktor Gyokeres? Just as you were starting to question Mikel Arteta's decision to start Mikel Merino - absent apart from his yellow card in the first half - the Spaniard pops up in the first minute of the second half to net the visitor's second after good play from both Declan Rice and Leandro Trossard. It's a mountain to climb for Slavia Prague now.
Josh Donaldson from Fortuna Arena
19:53 CET - The big news coming out of Anfield is that Florian Wirtz is starting for Liverpool, with the German replacing Cody Gakpo. As expected, Trent Alexander-Arnold is on the bench for Real Madrid.
19:39 CET - It's half-time in Prague, so here's the latest from our reporter, Josh Donaldson, at Fortuna Arena:
Slavia and Arsenal's players exit the field at half-time to a wall of noise from the home fans. It's been an intense atmosphere so far, normal for those who frequent Fortuna Arena regularly, but the 19,703-seater has lifted their team to be on level par for much of the first 45 against the Gunners.
They may be behind 1-0 to Saka's spot-kick, but the home fans will be buoyed by their players' willingness to chase and harry. They have missed an end product, but this well-drilled team under Jindrich Trpisovsky are holding their own.
Meanwhile, in Naples, there's nothing to separate Napoli and Frankfurt, with Antonio Conte's side edging a closely fought opening 45 minutes.
19:20 CET - Bukayo Saka has fired Arsenal into a 32nd-minute lead in Prague, via a well-taken penalty!
Josh Donaldson at Fortuna Arena: For all of Slavia's pressure, Arsenal set-pieces have come to the fore as the Gunners lead 1-0 through Saka's penalty. Corner after corner has peppered the hosts' box, and we awaited another. The referee was called to the screen by VAR to check a potential handball.
It does strike Lukas Provod on the arm, but it's a harsh foul. Arsenal won't care; they have their goal, and they will be confident of keeping their perfect Champions League form intact.
19:15 CET - We've reached the half-hour mark in both Prague and Naples, and we're still waiting for our first goal of the evening...
19:00 CET - An early update from our reporter, Josh Donaldson, at Slavia's Fortuna Arena:
If you thought Slavia Prague were going to roll over to Arsenal in the Czech capital tonight, you are sorely mistaken. Roared on by their fanatical 'tribuna sever', they have been pressing the Gunners all over the pitch, going man-to-man as they try and win the ball back high.
The closest they have come is through Lukas Provod in the opening skirmishes - Arsenal now know they are in a fight.
18:46 CET - We're now underway in both of this evening's early kick-offs. Stay tuned for all the latest updates from Prague and Naples!
18:00 CET - First to the team news for the early matches... Here's the lowdown from our reporter at Slavia Prague's Fortuna Arena, Josh Donaldson:
It's a big night for Slavia Prague, who welcome Arsenal to the Czech capital, looking to cause an upset against one of Europe's in-form teams.
Mikel Arteta revealed on Monday that Viktor Gyokeres didn't travel with the squad, and he is one of four changes to the Gunners' side who beat Burnley 2-0 on Saturday. In the Swede's place comes auxiliary forward Mikel Merino, whilst Ethan Nwaneri, Piero Hincapie and Christian Norgaard all make the starting lineup.
For the hosts, the player to watch is Youssoupha Sanyang. The fast Gambian is making his first Champions League start for Slavia, who will be an unknown quantity to Arsenal.
Below you can see how the teams will line up for Napoli vs Eintracht Frankfurt - still no Kevin De Bruyne or Romelu Lukaku for Antonio Conte's side:
17:45 CET - Hello and welcome to our coverage of the fourth matchday of the UEFA Champions League! We have another blockbuster set of fixtures to enjoy this week, and two absolutely standout fixtures later this evening as Liverpool host Real Madrid and holders PSG take on Bayern Munich.
But first, in the early matches at 18:45 CET, Arsenal take on Slavia Prague and Napoli host Eintracht Frankfurt.
Not sure what to watch this week in Europe? Take a look at our European Highlights here!
We will have all the major updates throughout the matches tonight and tomorrow right here!