Farrell replaced by Goode at 10 for Saracens
Hogg makes comeback for Warriors
Saracens won both pool meetings earlier this season
Glasgow attempting to reach semis for first time
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Saracens 15-7 Glasgow
Rory Lawson
Former Scotland captain on BBC Radio 5 Live Sports Extra
It shows how good Saracens are that Glasgow's defence for large parts of that was excellent. It was just brilliant execution from the former European champions.
David Strettle
Heads-up, switched-on rugby that Saracens have made their trademark.
Liam Williams hands off Adam Hastings and feeds Brad Barritt. His charge draws in full-back Stuart Hogg. Jamie George is the make-shift nine as the ball comes back quickly from the breakdown.
No worries. The hooker zips a mispass blind to David Strettle and the wing tiptoes down the touchline to dive in down the outside of a under-manned Glasgow defence.
Saracens 10-7 Glasgow
Scott Cummings is off for Glasgow with Jonny Gray into the second row.
Saracens 10-7 Glasgow
Saracens' breakdown crew are tardy once again.
Will Skelton goes into contact, but Glasgow are on the scene to secure the turnover while their Saracens counterparts are dawdling.
The hosts are wasting good field position because of that problem...
Saracens 10-7 Glasgow
Stuart Hogg's howitzer of a kick sails out on the full after Ali Price had passed back to him in the 22m.
Glasgow back under the cosh through a needless error.
Saracens 10-7 Glasgow
A superb piece of breakdown burglary by Glasgow in the shadow of their own posts.
Kyle Steyn and Matt Fagerson clamp down over the top of Alex Lozowski to earn a pressure-relieving penalty.
Saracens 10-7 Glasgow
Saracens are building some momentum. Their aerial game is earning easy yards as Rory Hughes spills an Alex Goode cross-field bomb under pressure from the chase...
Alex Lozowski
Saracens hit the front for the first time as Alex Lozowski slots from straight in front.
Saracens 7-7 Glasgow
Saracens go close, but George Kruis cannot haul in Alex Goode's offload off the floor. We are heading back for a knock-on from Sam Johnson anyway...
By the way, Maro Itoje indulges in a little bit of the bubbly stuff, feinting to chip over the top before charging into contact instead.
Saracens 7-7 Glasgow
Ben Spencer's box-kicking could not be better plotted if he has outsourced the trajectory to Nasa's number bods in Houston.
Two precise parabolas move Saracens up towards halfway after a bit of Glasgow pressure.
Saracens 7-7 Glasgow
Topsy Ojo
London Irish back
If both teams can keep this up, we're in for a brilliant day. It's end to end so we need to see now if one team can take hold of the game and make the most of the momentum.
Liam Williams (con Lozowski)
Straight back atcha!
Saracens land an immediate riposte. With Nigel Owens indicating a penalty advantage to the hosts, Alex Goode chips the free ball over the Glasgow defence for Liam Williams to compete for.
The Welshman is basically Biggles he is so good in the air. A clean take and he lands over the line to give Alex Lozowski a gimme of a conversion.
Saracens 0-7 Glasgow
Topsy Ojo
London Irish and ex-England back
It's brilliant footwork from Stuart Hogg. It's a great start, exactly what Glasgow needed to give them confidence and belief that they can put on a show here.
Ali Price (con Hastings)
Less than two minutes on the clock!
What a start by the visitors. They cut the Saracens defence to ribbons with Stuart Hogg straightening the line, drawing a defender and feeding wing Rory Hughes.
Saracens cover defence comes haring across, but Hughes flips the basketball pass inside and Ali Price saunters in.
Extras from Hastings.
Saracens 0-0 Glasgow
Stuart Hogg drops out deep to Saracens' Scottish wing Sean Maitland and the hosts' scrum-half Ben Spencer clears up to halfway...
Saracens v Glasgow (15:15 GMT)
The two teams trot out to the backdrop of ominous strings and roman candles.
Kick-off is imminent.
Saracens v Glasgow (15:15 GMT)
BBC Radio 5 Live Sports Extra
Glasgow head coach Dave Rennie, speaking on BBC Radio 5 Live Sports Extra:
"We spent a lot of time looking at them and getting clarity around where their strengths are.
"We’re really clear coming into this that we’re going to have to be good both sides of the ball.
"Stuart Hogg is massive for us. It’s not just his speed and attacking ability – it’s the quality of his kicking game."
Saracens v Glasgow (15:15 GMT)
Image source, GettySaracens head coach Mark McCall on BT Sport:
"Owen’s wife went into labour last night and we wish them all the best.
"Obviously it’s a huge day for them as a family and it looks like we’ll be without him for today. Family always comes first.
"Alex Goode’s been playing fly-half for us for the last five weeks and Liam Williams is a good replacement at 15."
Saracens v Glasgow (15:15 GMT)
Glasgow's Sam Johnson:"Having had that taste of international experience, as any rugby player wants to, playing at the highest level, it doesn’t get much higher in the club game than playing this weekend against Saracens.”
“It’s probably the hardest in Europe, isn’t it? They are a great team, they have been for years. They are going to come out all guns blazing with that power game. We’re going to go down there and do our best to win.
"To out-physical Saracens you need to be mentally prepared for it because if you’re not mentally prepared, not 100%, you’re going to come out second best."
Image source, SNSSaracens v Glasgow (15:15 GMT)
Image source, Getty ImagesScotland star Stuart Hogg will make his first appearance in seven weeks for Glasgow.
Hogg injured his shoulder in the Six Nations match with Ireland in February and hasn't played since.
Co-captain Ryan Wilson, Tommy Seymour, DTH van der Merwe, Huw Jones, Nick Grigg and George Turner are among those who remain sidelined with injury.