Final score: Exeter Chiefs 34-12 Castres
Exeter Chiefs score 5 tries to secure bonus point
Castres score 2 tries
Tudor Stroe shown red card for Castres
Jack Nowell Man of the Match after scoring try on his return
Choose from BBC Radio 5 live sports extra & BBC Radio Devon commentary
Exeter 17-5 Castres
Santiago Cordero makes a break in midfield
Exeter's attack is rapid. It looks as though they'll break through, but Henry Slade fumbles the ball. You can see the pain on his face, he's cost Chiefs the bonus-point try. Castres scrum just in front of their tryline.
Exeter 17-5 Castres
A neck roll from Exeter wing Tom O'Flaherty gives Castres a penalty and they kick to touch.
They send the ball to the left wing, but Jack Nowell has pilfered it at the ruck. What a return he's having.
Exeter 17-5 Castres
Geoffrey Palis puts in a beauty of a kick from inside Castres'. It just bounces in before going out.
Exeter keep the line-out safe, but Nic White's kick doesn't make it far.
It bounces well for Chiefs though and Joe Simmonds grabs the ball, running it into Castres' half.
Image source, AFP
Brent Pilnick
BBC Sport at Sandy Park
Classic Exeter right there.
There are not any sides that can keep out the ferocious Chiefs pack when they are camped out on their own tryline.
A great moment for England hopeful Jonny Hill after a few months out with a knee injury.
Exeter 17-5 Castres
But Exeter have stolen the ball and are attacking again on the 22. Chiefs look so dangerous now.
Jack Nowell struggles to keep hold of an offload, but it's deemed to be forward anyway. Castres have a scrum just outside their 22.
John Lockyer
Former Exeter Chiefs captain on BBC Radio Devon
Jonny Hill is 6ft 8ins and he stretched his huge frame over the line to score Exeter's third try.
Image source, PAExeter 17-5 Castres
The sun seems to have disappeared, making it easier for Sam Skinner to claim the restart.
Nic White kicks it back to the visitors who go to run it out of their half.
Exeter 17-5 Castres (Hill)
An Exeter try seems inevitable from that distance.
Chiefs pick and go until there less than a metre out, then pop it out to Jonny Hill who easily makes it over.
Joe Simmonds gets his first conversion of the match.
One more try for the bonus point.
Exeter 10-5 Castres
Joe Simmonds finds touch.
The ball is sent right until it finds Jack Nowell, who is brought down but gets back up to scramble forward another few metres.
Chiefs are 5m from the tryline.
Exeter 10-5 Castres
Exeter have a scrum about 15m outside their 22. It collapses and Chiefs win a penalty.
Exeter 10-5 Castres
Exeter lose the line-out and Castres waste no time. They're straight up the field and make it deep into Exeter's half.
The Chiefs' defence quickly recovers though and piles on the pressure, forcing a knock-on.
Image source, AFPExeter 10-5 Castres
Castres keep hold of the ball out of the scrum and put up a clearing kick.
Jack Nowell has possession again, but finds no way through.
Sam Skinner has a bit of space on the right wing but the ball's in touch.
Exeter 10-5 Castres
An Exeter knock-on gives Castres possession.
Exeter 10-5 Castres
And the crowd, in turn, is lifting Jack Nowell.
He fizzes through the defence to bring Exeter up to the 22.
Brent Pilnick
BBC Sport at Sandy Park
That second try has really lifted Exeter and the crowd.
You feel this is their chance to turn the screw on Castres as they desperately need a four-try bonus point if they want to make the last eight.
Image source, Getty ImagesExeter 10-5 Castres
Castres clear to touch, but the line-out goes astray and Exeter have possession.
It's great work on the floor from Benjamin Urdapilleta though and he grabs the ball back.
Exeter 10-5 Castres
Jack Nowell gathers the restart on Exeter's 22 and Nic White kicks it high.
Castres attempt to run it from the halfway line, but Exeter steal the ball back, kick through and are already almost up to the tryline.
Referee George Clancy blows for a Castres penalty.
John Lockyer
Former Exeter Chiefs captain on BBC Radio Devon
Wonderful work from the forward, it was a great scrum, then Ollie Devoto with a real bit of class, took on two defenders and got the ball out the back of his hand.
Exeter 10-5 Castres (Simmonds)
No. Exeter opt to pass it instead and it works perfectly.
Ollie Devoto puts in an incredible offload, dancing round his defender and popping the ball backwards to send Joe Simmonds over.
The fly-half cannot convert his score.
Exeter 5-5 Castres
Will we see a Chiefs special pick-and-go try?