Lively Monaco forward Maghnes Akliouche tries to catch Guglielmo Vicario out at his near post but the Spurs keeper makes the save.

Chelsea, with the game surely won, make three changes at the break.

Andrey Santos, Trevoh Chalobah and Tyrique George replace Marc Guiu, Tosin Adarabioyo and Enzo Fernandez.

Phil McNulty
BBC Sport chief football writer in Monaco

Eric Dier is missing a reunion with former club Spurs tonight as he is out of the Monaco side because of injury, having earned them a point with a stoppage time penalty against Manchester City in their last Champions League game.

He has just been spotted walking around the pitch by the Spurs fans, who broke into warm applause, which he readily acknowledged.

Ajax brings on Davy Klaassen, who takes the captain's armband. Wout Weghorst is replaced.

Tottenham forward Richarlison is booked for a foul.

Stephen Warnock
Former Liverpool defender on MOTD: UEFA Champions League

One of the things we are going to talk about on the show is that there are definite pros and cons of this new Liverpool shape, which was 4-4-2 without the ball in the first half but more like a 4-2-3-1 with it.

They have dominated the ball and are controlling the game, and created some big chances in open play as well as scoring from set-pieces.

The downside of setting up like this is when they lose the ball, because they are left open when they have that many attacking players high up the pitch.At the moment they look vulnerable defensively on the transition but that could be because their two defensive midfielders in this formation (Szoboszlai and Jones) are not defensive minded.

If you put Gravenberch and Mac Allister in there instead, they are players who sense danger rather than react to things like Szoboszlai and Jones are. They would be a lot more solid.

You can hear more from Warnock on MOTD: Uefa Champions League at 22:40 BST on BBC One and the BBC Sport website and app.

Liverpool's record signing Alexander Isak is replaced at half-time by Federico Chiesa.

Some second halves are kicking off.

Image source, Getty Images

Marseille lead Sporting heading into the second half, however they will have to play at least 45 minutes with 10 men.

Emerson was shown a second yellow card just before the break.

Spurs keeper Guglielmo Vicario had five saves to make in that first half. Including three against Folarin Balogun, who only had 13 touches of the ball.

Ajax have conceded four goals in the first half of a European match for the first time since February 1958 against Hungarian side Vasas in the European Cup.

Virgil van Dijk has scored 30 goals for Liverpool in all competitions - 26 of which have been headed. Since his debut for the club in January 2018, the only player to score more headers for a single Premier League club is Harry Kane for Tottenham Hotspur (34).

Liverpool

After all the stick that has come his way the past few weeks, is there a more relieved player than Ibrahima Konate right now?

His bullet header was even more powerful than Virgil van Dijk's goal.

Image source, Getty Images

Image source, Getty Images

That is Estevao's first Champions League goal. He scored five in the South American version, the Copa Libertadores. And one in the Club World Cup... against Chelsea.

Paul Robinson
Former Tottenham goalkeeper on BBC Radio 5 Live at Stamford Bridge

Image source, Getty Images

This is a young 18-year-old Brazilian who is full of confidence.

The whole of Stamford Bridge fell silent watching him - he didn't rush, he had a long run-up, had a stutter and absolutely pinged it into the top right corner.

It is easy to take a penalty when you are 3-1 up, but he is 18 years old at a new club. That is a fantastic penalty.

Chelsea have scored four goals in the first half of a Champions League match for the first time since October 2011 vs Genk.

Chelsea are in control at the end of a half with three penalties and a red card.