Christian Pulisic carries it through the middle as they break and wins a free-kick.

Luis Diaz picks up a card too. Chelsea have played this game perfectly.

Hakim Ziyech is on for Mason Mount.

Corner for Bayern. Six minutes to go.

Javi Martinez on for Eric Maxim Choupo-Moting and the set piece comes to nothing.

We said Sane v Bakker could be a crucial battle and Bayern's Sane has twisted Bakker left and right.

Sane then gets the ball on his less-favoured right foot and drags it just past the far post. PSG survive again.

Free-kick for Porto... Flicked on in the middle by Chancel Mbemba but there's nobody on the end of it.

Paris St-Germain have 10 minutes plus injury time to see this out. Time running out for Bayern. One goal changes everything.

Thiago Silva needs a bit of treatment and it looks like Kurt Zouma is being readied to come on.

Hakim Ziyech is also getting ready.

Kylian Mbappe storms through from almost the halfway line, he is one on one with Manuel Neuer and smashes the ball into the roof of the net. Lovely finish.

But then the assistant's flag goes up and Mbappe had started his run too early. No goal.

Antonio Rudiger deals with the next corner too - a nervy ricochet eventually falls into Edouard Mendy's arms.

Moise Kean, running at the Bayern defence when coming in from the left flank, but he makes a right mess of the shot, sending it miles over the top for the French side.

Pepe almost gets on the end of a corner from the left for Porto but Reece James beats him to it.

It's curled in from the other side but Antonio Rudiger is the one to nod it behind this time.

Ian Dennis
BBC Radio 5 Live senior football reporter

You can see the desperation in Porto now. But for all their possession they've not looked like scoring. Chelsea have defended superbly.

Fifteen minutes to go. Level on aggregate, but PSG advancing as it stands thanks to the three goals they scored in the snow at the Allianz Arena last week.

The reigning European champions have 15 minutes to get a goal, or their title defence will fall at the quarter-final hurdle.

Mason Mount whips a corner in from the right. Kai Havertz is the target but it's slightly too high for him.

Bayern's Jamal Musiala, the hugely talented 18-year-old midfielder who played for England Under-21s before opting to represent Germany at senior level, is on for the last 20 minutes, replacing Alphonso Davies.

PSG also make a change with ex-Everton man Moise Kean the chance to be a hero and he replaces Julian Draxler.

Rob Green
Former England goalkeeper on BBC Radio 5 Live

Moussa Marega has worked hard as a centre-forward tonight but he just doesn't get in the right positions to score.

His physical presence, the size that he is... get yourself in between the post, get yourself in front of goal. He doesn't.

For all that hard work, you want to be scoring goals.

Thiago Silva stretches at the near post to clear a dangerous cut-back from Chancel Mbemba.

He does well in the end but there were no Porto attackers near him. Chelsea had three players protecting the goalline.

PSG are living dangerously. One goal conceded without reply and they're out.

Leandro Paredes is well placed inside his own six-yard area to deal with a header from Bayern's Kingsley Coman, who had got himself free and should've done better.

This has just been so easy for Chelsea. It doesn't feel like a Champions League quarter-final.

It's basically a group game where Chelsea have already qualified. They look more threatening on the break than Porto have looked all night.

A lunge from Thomas Muller catches Leandro Paredes and that's yellow for the Bayern man.

That's him and David Alaba in the referee's notebook, along with PSG's Colin Dagba.