Referee Frank Murphy angers the home crowd with a very harsh decision, ruling that challenge from Alex Allan serious foul play.

Scott Cummings made the tackle on Jake Ball and prop Allen then caught Jake Ball with his arm on his way down.

That changes the whole dynamic of the game with Warriors a man down.

Image source, SNS

Colin Gregor
Former Scotland Sevens captain on BBC Radio Scotland

Lewis Rawlins is off the Scarlets' bench earlier than expected as Jake Ball goes off for a head injury assessment after a collision with Alex Allan.

The TMO is going to have a second look...

Scarlets put some phases together in enemy territory and it's all a bit hectic as both sides bash the living daylights out of each other.

Fraser Brown
Glasgow and Scotland hooker on BBC Radio Scotland

Offside. Glasgow go for the posts this time and Brandon Thomson does the business to level the game.

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Good throw, good take but Glasgow get their attacking line all wrong and are pushed out of play near the corner. This time Scarlets have the line-out and they deal with it well, clearing their lines.

To compound the home side's misery, the next line-out is overthrown and all the pressure is off the visitors.

Colin Gregor
Former Scotland Sevens captain on BBC Radio Scotland

Another penalty for not releasing goes against Scarlets and again Glasgow kick to the corner.

The scrum collapses and Rhys Patchell pops over a simple kick.

Glasgow bungle that attack as a loose tap-pass from Adam Ashe concedes possession and Ruaridh Jackson has to scamper back deep into his own half to smother a long kick up the field.

Now Scarlets have a scrum put-in on the home 22.

The Scarlets defence stands firm after the first wave of home attacks then the visitors are penalised for not releasing and Glasgow kick to the corner.

Warriors will want to get the ball to Niko Matawalu as often as possible since the wee Fijian is on fire right now.

The winger has run in five tries in his last two outings - wins over Ospreys and Blues - celebrating his 100th club appearance in style last week with a brace.

Can he keep his scoring run going today?

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Brandon Thomson launches it long into the Scarlets 22 and we're up and running...

Glasgow head coach Dave Rennie tells BBC Scotland that he has placed "massive emphasis" on next week's trip to Lyon but he's hoping to keep recent momentum going for the Conference A leaders.

"We've played really well in these past three games," he says. "It's been a test of our depth and we'll learn about some more young fellas today.

"Both sides are minus a few players, so we haven't really talked about that last encounter."

Glasgow: Ruaridh Jackson; Robbie Nairn, Nick Grigg, Stafford McDowall, Niko Matawalu; Brandon Thomson, George Horne; Alex Allan, George Turner, D'Arcy Rae, Tim Swinson, Scott Cummings, Matt Smith, Chris Fusaro (capt), Adam Ashe.

Replacements: Kevin Bryce, Oli Kebble, Siua Halanukonuka, Kiran McDonald, Tevita Tameilau, Nick Frisby, Paddy Kelly, Ratu Tagive.

Scarlets: Johnny McNicholl; Tom Prydie, Jonathan Davies (capt), Keiron Fonotia, Steff Evans; Rhys Patchell, Kieran Hardy; Rob Evans, Werner Kruger, Jake Ball, Steve Cummins, Will Boyde, Dan Davies, Uzair Cassiem.

Replacements: Dafydd Hughes,Wyn Jones, Simon Gardiner, Lewis Rawlins, Tom Phillips, Sam Hidalgo-Clyne, Paul Asquith, Clayton Blommetjies.

Wales centre Jonathan Davies will lead the Scarlets after playing three Tests in the autumn internationals - that's as many games as he's managed for his club this season.

Fellow internationals Rhys Patchell, Rob Evans and Jake Ball are also back, along with wing Steff Evans, but regular captain Ken Owens, Gareth Davies and Hadleigh Parkes have been rested and Leigh Halfpenny is still recovering from concussion.

Image source, Getty Images

With one eye on the Champions Cup trip to Lyon next time, the hosts make nine changes from last weekend's win over Cardiff Blues.

With Scotland stars getting a rest, there's a first start for wing Robbie Nairn, Brandon Thomson takes on the fly-half duties and club stalwart Chris Fusaro come into the pack to captain the side.

Lock Tim Swinson is in after making his return from long-term injury as a replacement against the Blues.

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Scarlets thoroughly enjoyed their last visit to Glasgow but they were less than impressed by the artificial pitch at Scotstoun, complaining of skin burns and blisters.

Full-back Johnny McNicholl went as far as saying the surface should be "illegal".

Earlier this week, the hosts tweeted a picture of their ground featuring an award from the Institute of Groundsmanship.

Scarlets head coach Wayne Pivac said he "would not mind a bit of water on it" and the New Zealander will be pleased to hear that it's been raining pretty much non-stop in the west of Scotland for weeks.

Welcome to what is a repeat of last season's semi-final. In May, Scarlets turned up at Scotstoun and absolutely battered Glasgow, easing to a 28-18 victory.

With so many top stars missing at this time of year and not so much on the line, we may not get the same level of intensity today.

However, Glasgow have not lost at home since that bruising day and will not want to surrender that record, while Scarlets will need to improve on a ropey away record this term to have a chance of upsetting the natives again.

Image source, Getty Images