Chelsea bring on £60m Marc Cucurella for £45m Ben Chilwell at left-back.

Not seen that before.

Dortmund take a clever throw with the ball going against the back of Giovanni Reyna to tee it up for a team-mate only for Copenhagen's Dutch defender Kevin Diks to come and absolutely clean him out when he's nowhere near the ball. And not even a booking.

Meanwhile, Youssoufa Moukoko, 17, and Emre Can come on for the hosts who are looking very comfortable.

Mason Mount puts in a dangerous inswinging ball but Armando Broja's outstretched boot can't make contact. We are 75% of the way through this game now.

Chelsea defender Kalidou Koulibaly is booked for chopping down Mislav Orsic on the halfway line as Dinamo threaten another dangerous break like they had for the goal.

Home fans boo as Chelsea's Mason Mount catches Stefan Ristovski in the face. The referee seems to give Zagreb a free-kick and then changes his mind.

Reece James crosses and Armando Broja can't jump high enough to head it in.

The ball breaks for Hakim Ziyech in the box but he lifts the ball over everyone's head in the centre.

Thomas Tuchel takes a drink of water.

Martin Keown
Former England defender on BT Sport 4

Aubameyang just doesn't look right, right now. Whether it’s that jaw or games, because he’s been out for a little while, he didn't seem to have his usual conviction in front of goal.

A warning for Chelsea...

A team have never lost their opening match and gone on to win the Champions League that season.

Chelsea make a double change.

Pierre-Emerick Aubameyang wasn't quite on it tonight and he's replaced by Armando Broja for his Champions League debut.

Jorginho replaces ex-Dinamo man Mateo Kovacic.

Chelsea want a penalty as Josip Sutalo nudges Kai Havertz in the back. It's not enough contact really though and the referee says no.

Mason Mount is booked for dissent.

Image source, BBC Sport

Manchester City manager Pep Guardiola makes three changes to the side that began the 1-1 draw against Aston Villa in the Premier League at the weekend.

John Stones and Kyle Walker are both out with minor injuries while Ilkay Gundogan drops to the bench. In come new signing Manuel Akanji, Sergio Gomez and Jack Grealish.

Man City XI: Ederson, Joao Cancelo, Akanji, Dias, Gomez, De Bruyne, Rodri, Bernardo Silva, Foden, Haaland, Grealish.

Subs: Phillips, Ake, Gundogan, Ortega, Alvarez, Mahrez, Carson, Palmer, Lewis, Wilson-Esbrand.

Image source, BBC Sport

Sevilla boss Julen Lopetegui makes five changes to the side that started the 3-0 La Liga defeat against Barcelona at the weekend.

Erik Lamela misses out altogether while Gonzalo Montiel, Joan Jordan, Youssef En-Nesyri and Fernando drop to the bench.

That means on-loan Manchester United defender Alex Telles starts along with former City winger Jesus Navas, Thomas Delaney, Alejandro Gomez and Jose Angel Carmona.

Sevilla XI: Bounou, Carmona, Gudelj, Kouassi, Alex Telles, Jesus Navas, Rakitic, Delaney, Acuna, Isco, Gomez.

Subs: Dmitrovic, Montiel, Rekik, Dolberg, Suso, Jordan, Januzaj, Mir, En-Nesyri, Fernando, Salas, Flores.

Dinamo Zagreb have weathered that storm somewhat. They come on the attack... and are inches away from scoring.

Stefan Ristovski hammers in a shot from almost 30 yards out which Kepa does very well to tip onto the post.

An absolute screamer, that would have been.

Follow the Celtic v Real Madrid live text here.

Chelsea have been much more threatening since the restart. A cross is cleared away. They did start the first half too well, mind...

Darren Fletcher
BT Sport 4 commentator

That’s more like it from Chelsea. It’s a rare occasion tonight that Chilwell has gotten the better of Moharrami.

Pierre-Emerick Aubameyang is denied a debut goal by the offside flag.

Ben Chilwell has just strayed as he runs onto a long ball. He lays it into the path of Aubameyang at the back post. The striker buries it but it's disallowed.

Hakim Ziyech has doubled Chelsea's shot on target total within two minutes of coming on. The Moroccan's 20-yard effort is saved by the keeper.

The second half begins.