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 24-12 Castres
Castres have a scrum inside their 22. It all gets a bit sloppy as Maama Vaipulu tries to chip through. It rebounds off an Exeter player and Henry Slade gets hold of the ball.
He sends it to Jack Nowell, but the full-back knocks on.
Brent Pilnick
BBC Sport at Sandy Park
You will not hear a bigger roar for a try today than for that last Exeter one.
Not only for the bonus, but also for Tom O’Flaherty who has taken his chance in this Chiefs side in recent weeks.
With injuries to Nowell, Woodburn and Cuthbert the inexperienced Welshman, who was playing in the Welsh Premiership a couple of years ago, has really stepped up.
But that quickfire Castres try that followed shows how dangerous the French champions can be.
Image source, Getty ImagesExeter 24-12 Castres
Exeter drive straight back at the Castres defence and they have numbers on the left.
The French side quickly scramble back though and close down Tom O'Flaherty and Jack Nowell.
Exeter 24-12 Castres (Combezou, Urdapilleta(con))
What a response from Castres. A show and go from Thomas Combezou and he's across the line.
Benjamin Urdapilleta sends the conversion straight through the middle.
Image source, AFPExeter 24-5 Castres
Castres are not done yet. David Smith times a run well to cut through the Exeter defence. The visitors are up to the 5m line.
John Lockyer
Former Exeter Chiefs captain on BBC Radio Devon
That was an inch perfect kick from Henry Slade. What a talent that young man is.
Exeter 24-5 Castres (O'Flaherty, Simmonds (con))
Just incredible from Henry Slade.
He steps inside his defender and sends a perfectly-weighted kick through. Tom O'Flaherty is too fast for his opposite number and tumbles over the tryline.
Chiefs have the bonus point. That could be crucial.
It's a tough conversion for Joe Simmonds out on the left, but he edges it through the posts.
Exeter 17-5 Castres
Exeter's Harry Williams is on for Tomas Francis.
Castres have brought on Kevin Firmin for Jody Jenneker, Tudor Stroe for Antoine Tichit and Rory Kockott for Ludovic Radosavljevic.
Exeter 17-5 Castres
We're back under way.
Exeter send the restart straight back and Castres gather. A high tackle gives the French side a penalty on the halfway line.
HT: Exeter 17-5 Castres
Chiefs are back out on the field, followed by Castres.
#bbcrugby
James Kelly: Good to see Exeter Chiefs showing once again the myth they can't play attacking rugby and run it from their own half is rubbish! Fantastic breaks and counter attacking in the first half.
HT: Exeter 17-5 Castres
John Lockyer
Former Exeter Chiefs captain on BBC Radio Devon
Exeter are looking so hungry, so passionate and so motivated.
HT: Exeter 17-5 Castres
How impressive is this guy?
Jack Nowell is enjoying his return.
He's just got the one try so far, but with some of the breaks he's been making you'd expect him to score more in the second half.
Nowell's definitely sending a message to England head coach Eddie Jones with the Six Nations coming up.
Image source, Getty ImagesHT: Exeter 17-5 Castres
Chiefs prop Tomas Francis has an admirer...
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HT: Exeter 17-5 Castres
John Lockyer
Former Exeter Chiefs captain on BBC Radio Devon
That was absolutely fabulous. I think Castres will be pleased to be going into the dressing room only 17-5 down.
What a 40 minutes we've got in store coming up.
HT: Exeter 17-5 Castres
Exeter ideally need a bonus-point win to keep their hopes of qualifying for the quarter-final alive. It's looking very promising so far, they just need one more try in the second half.
Image source, ReutersHT: Exeter 17-5 Castres
There's more defensive pressure from Castres now and the ball slips through Matt Kvesic's hands as he's brought down.
The visitors cannot capitalise though and send the ball loose. Nic White kicks it through and gives chase, but trips and that brings up half-time.
Brent Pilnick
BBC Sport at Sandy Park
Exeter will really miss Santiago Cordero when he leaves for Bordeaux in the summer.
The elusive Argentine has been superb in recent weeks, carrying the attacking burden after injuries to Jack Nowell, Olly Woodburn and Alex Cuthbert.
He’s been superb again today and is causing the Castres defence all sorts of problems.
Exeter 17-5 Castres
Exeter are clearly keen to make the most of the dry weather in Devon. They're playing some beautiful running rugby.
But Chiefs give away a penalty and Castres kick to touch on the halfway line. The French side lose possession at the set-piece again though.
Exeter 17-5 Castres
Castres initially run it out of their 22, but Geoffrey Palis opts to kick it in the end. Exeter have a line-out just outside the Castres 22.