Angel di Maria's cross is blocked out for a corner. PSG need something to happen very soon.

Hassan Anfield: Both in terms of defending and attacking Trent Alexander-Arnold's far better than Joe Gomez.

Lotak: Are the two games making up for the first legs's excitement by being 0-0s? Does this mean the Utd v Sevilla game will be a goal fest?

Mike, Gairloch: The only 'duty' Klopp has is to get Liverpool into the next round.Constantly berated for being gung-ho when it isn't needed and not managing games. When he manages games, vice versa. It's almost like people need to fit their own Klopp narrative.

Image source, Reuters

Majeed Waris strikes the first shot on target in this game and it was a fairly good one for Porto.

Loris Karius dives low to his right and pushes it wide for a corner.

Pat Nevin
BBC Radio 5 live at Parc des Princes

He was never going to miss that. Brilliant header down, but all questions are to be asked of Dani Alves. Poor from Dani Alves, he might have killed his team's chances in the Champions League this season.

Cristiano Ronaldo's first sniff at goal and it's almost in the back of the net. Amongst all the smoke from the flares, he throws himself at Marcelo's left-wing cross but his header goes just wide.

Edinson Cavani lays the ball off to PSG midfielder Thiago Motta, who lashes one about a million miles over the bar from outside the box.

Lots of red flares coming from one of the stands behind the goal. And I mean lots. The referee holds up play for about a minute but we can continue.

I'm sure Uefa will be giving them a fine for that.

Adam Lallana, making his first start in two months, crosses from the left and James Milner slides the ball wide - he's slipped up as he's hit it.

Some good footwork from Kylian Mbappe to find Dani Alves, but his low cross is blocked.

Surely PSG are going to have to have a proper go in this half. Death or glory.

The first Champions League game this season with no shots on target. A better second half please.

Gordon Macgregor: PSG look like a side that’s had it way too easy in their own league and can’t step any more - sad!

David Robinson: The tie was over weeks ago. Liverpool knew that. Porto knew that. How did people expect the second leg to go? It was always going to be a quiet game.

Image source, Reuters

Imagine the scenes if PSG brought on Neymar now and it was all a ruse.

Owen Hargreaves on BT Sport: "Whoever loses this game is out of a job in the summer regardless. There is just too much at stake."

Image source, Getty Images

Alistair Bruce-Ball
BBC Radio 5 live at Anfield

Exactly as expected. A really rather humdrum first half with Liverpool having killed this tie off in the first leg. That's not to say Liverpool haven't tried to impose themselves again but they're not at full strength and it doesn't feel like they're at full tilt either with a trip to Old Trafford coming up on Saturday.

Sadio Mane hit the post with a sweet strike after Alberto Moreno initially did some great work down the left-hand side to get the move started but that's been about it.

I think Liverpool fans are probably more interested in the results of all the other quarter-final ties over the next nine days to see who they might meet in the quarter-finals.

Ian Dennis
Radio 5 live senior football reporter in Paris

PSG have scored three or more goals in each of their last eight matches at home but face a massive 45 minutes to turn this around.

Too much patience and not enough penetration means PSG only troubled Keylor Navas just before half-time.

The onus will be on Unai Emery to change it otherwise a European exit will ultimately mean a change of manager for PSG.

Image source, Getty Images