Matt Kowech: PSG are so devastating going forward. Mbappe's pace, Neymar's skill and Di Maria's precision.

Robbie: There is something magical of watching football in the snow.

Sulaimon: Zanusi is a relentless player, learning from Pepe. Proud he is a Nigerian.

Bayern have responded well since falling behind and have the PSG defence under constant pressure.

Leroy Sane does well on the right and gets the ball into the box. PSG struggle to clear the danger before Leon Goretzka's shot on the edge of the box is held by Keylor Navas.

Josh Earl: Dream start for PSG. Poor from Neuer.

Seth Gogo Egoeh: Chelsea could win 1-0 today and go out on away goals rule if they lose 2-1 next week despite playing at the same venue. Madness!

Second chance for Porto in a minute. A cross is half-cleared to Mateus Uribe, who takes a touch and hits a sweet half-volley just over the bar

Porto striker Moussa Marega is under pressure on the right but digs out a good cross to Luis Diaz, whose shot is blocked.

Porto winger Corona sends his defender one way and then the other but his cross is an easy one for Edouard Mendy.

Clinton Morrison
Former Crystal Palace striker on BBC Radio 5 Live

It's been a slow start but Porto are doing exactly what they did against Juventus. They just get back in their numbers and they make it hard for teams to break them down.

Chelsea will have all the possession but Porto will just look to break and get a goal on the counter-attack: that's how they did it against Juventus. Porto have the pacy players to do it.

But at the moment, Chelsea are dominating and will want to get that all-important away goal.

Kylian Mbappe's opener after just 149 seconds is the earliest that Bayern Munich have conceded a goal from the start of a Champions League knockout stage match since March 2010, when Wayne Rooney scored past them after 63 seconds.

The snow continues to fall heavily as Bayern Munich are given a free kick right on the edge of the area following a handball by Idrissa Gueye. Joshua Kimmich steps up but fires his effort straight into the wall.

Awful. Porto have a free-kick on the right wing but it's sliced across and Zaidu Sanusi ends up having to play it back to his goalkeeper to avoid taking any risks with the poor pass.

Clinton Morrison
Former Crystal Palace striker on BBC Radio 5 Live

Mauricio Pochettino and Paris St-Germain will surely have a good chance tonight. Especially with Bayern Munich missing Robert Lewandowski. That is a huge blow for them.

Chelsea play a short corner and then Mateo Kovacic just pumps a long ball forward into the keeper's arms.

Chelsea have had most of the ball and are playing a lot down both flanks. They win a corner now.

Clinton Morrison
Former Crystal Palace striker on BBC Radio 5 Live

The Chelsea players will be looking forward to this game after the West Brom result at the weekend. After you've lost like that, you are always looking for the next game. You want to put it right.

One thing Porto do, though - they press ever so well.

Bright, bright start by Bayern Munich as they go close twice in quick succession. First, Lucas Hernández drives into the box from the left before his shot is deflected behind for a corner, from which Eric Maxim Choupo-Moting heads onto the bar.

Kai Havertz gets in behind Porto's defence but as he plays the ball across the six-yard box, nobody is there.

Clinton Morrison
Former Crystal Palace striker on BBC Radio 5 Live

Obviously Chelsea are favourites for this one, but I don't think the game is going to be as easy as everyone thinks it will be.

Chelsea start the game with plenty of possession and Porto putting them under constant pressure.

Under way in Seville (21C) and Munich (1C).