John: Not a surprise United had a lead of two goals because of two goalkeeper errors. It is not through any improvements in their play and their defence is still like a sieve.

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It's been pretty much 100mph stuff all half but play is stopped to allow Lisandro Martinez treatment after a challenge.

A good run by Mykhailo Mudryk followed by a poor pass. Dare I say textbook?

Good through ball by Renato Veiga and Joao Felix tries to nick it round the goalkeeper, who dives at his feet to collect the eball.

Rolando Mandragora curls a lovely effort towards goal, but it strikes the upright.

The best chance for Fiorentina so far.

This is enormous fun.

Now a big chance for Manchester United and Caemiro's close-range attempt is blocked.

Lucy Ward
Former Leeds striker on TNT Sports

Chelsea just need to get back a grip of this game.

Can they get control further up the pitch, like they had for the opening half an hour at least?

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Porto's fans celebrated Samu Omorodion's goal with chants of 'S-A-M-U, S-A-MU, S-A-M-U'.

Aged 20 years and 151 days, Omorodion is the second-youngest player to score against Manchester United in the Europa League, after Iker Muniain for Athletic Bilbao in March 2012 (19 years, 80 days).

Fiorentina have had over 70% possession, but they have only had two shots on target as we approach half-time.

You'd say this is beyond The New Saints' wildest dreams so far. They are holding last season's finalists.

Chelsea captain Axel Disasi heads a Gent corner away.

Clinton Mata goes down and receives treatment but he is unable to continue. It looks like a problem with his right hamstring.

Moussa Niakhate replaces him.

This is breathtaking entertainment. End-to-end, both teams really going for it.

United could do with getting to half-time without conceding another.

Another cross into their penalty area is just about cleared.

Nizaar Kinsella
BBC Sport football news reporter

Mykhailo Mudryk gave away the ball which has led to another Gent attack as the Belgian side suddenly come into this match.

Efforts from Englishman Archie Brown and Andri Gudjohnsen, son of Chelsea legend Eidur, who is watching from stands felt against the run of play but Chelsea suddenly got sloppy and were lucky to be let off.

Manager Enzo Maresca suddenly looks frustrated as his team fall below the standard of their exceptional early showing.

Chelsea are back to dominating the ball now. Did they weather that Gent mini storm?

Paul Robinson
Former England goalkeeper on BBC Radio 5 Live

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We can see it, but why can't Manchester United see it and do something about it.

Samu Omorodion is so clever and it's a free header! He finds himself between the United centre-halves.

A decent little flick into the box and Samu powers his header above Onana.

Vaclav Cerny cuts inside and has a shot from the edge of the box which is deflected behind for a corner.

James Tavernier swings it into the box but the danger is cleared.

Lucy Ward
Former Leeds striker on TNT Sports

Much better.

Gent are committing bodies forward. Look how many yellow shirts there are!

All of a sudden, they've just connected a few passes!

The temperature goes up another notch.

The referee marches over to the Manchester United bench to show coach Ruud van Nistelrooy a yellow card.

United could do with Van Nistelrooy on the pitch.

Lyon are so dangerous on the break.

Rayan Cherki and Malick Fofana in particular are causing problems going forward with their pace and quick feet.