Ireland hooker Rory Best will take over from Johann Muller as the new captain of Ulster, it has been announced today.
Rory Best has played 152 times for his province and returns to the captaincy role that he first held from 2007 to 2011.
The 31-year-old has also captained Ireland on four occasions and led out the British & Irish Lions against the Brumbies in the 2013 tour to Australia.
Commenting on the Ulster captaincy, Best said: "It is a huge honour to captain your province. I enjoyed doing it a few years ago but in 2011, I felt I just needed to step down and to concentrate on my game.
"We also had a ready-made captain in the squad in Johann (Muller) which made it easier and he did a fantastic job.
"It is nice to have been asked to do it again. With the extra experience that I have gained at provincial and international level in recent years I believe that I am more equipped than ever before to lead this group of players.
"Being the captain of Ulster is something that I absolutely love doing and I am looking forward to the challenge of the new season."
Leinster gave Castres a 14-0 head start when the sides met at Stade Pierre-Antoine last January. Matt O'Connor's men fought back to take a 29-22 victory that day and will be aiming for a similar outcome on Sunday afternoon.
Sandy Park in Exeter is the venue for Connacht's 100th European Challenge Cup match. Win number 52 would see the province cement their place at the top of Pool 2, ahead of their December clashes with Bayonne.