Following the departure of director of rugby David Humphreys, Ulster Rugby has today announced that head coach Mark Anscombe is to leave the province with immediate effect.
Les Kiss will take-up the position of interim director of rugby to allow time for a review of the coaching structures at Ulster Rugby to take place.
Kiss will continue as Ireland assistant coach and will combine his duties with the international side with his new role at Ulster.
Ulster Rugby Chief Executive Shane Logan said: "I would like to pay tribute to the contribution that Mark Anscombe made over the past two seasons and to thank him for his hard work and dedication. Everyone at Ulster Rugby wishes him well for the future.
"Les Kiss will have an expanded remit for the province's director of rugby and will lead the coaching staff, assisted by Jonny Bell and Neil Doak, and will manage first team selection. His appointment allows us time to recruit for long-term success."
Les Kiss will start work at Ulster Rugby on July 19.
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.