South African scrum-half Ruan Pienaar signs a three-year contract with French Top 14 side Montpellier after leaving Ulster.
South African prop Schalk van der Merwe's Ulster debut looks likely to be delayed as he requires shoulder surgery.
Ulster will play Wasps, La Rochelle and Harlequins in Pool One of next season's European Champions Cup.
Ulster appoint Grenoble forwards coach Aaron Dundon to Les Kiss' backroom team as he is named as scrum coach.
Audio & Video
British and Irish Lions head coach Warren Gatland praises Jared Payne and Rob Henshaw after selecting the Ireland pair in the team to face the Blues on Wednesday.
How to get into rugby union
How to get into rugby union - into the thick of the 15-player game or try rugby sevens, which made its Olympic debut in 2016.
Rugby alerts, newsletters and social media
Get latest scores and headlines sent straight to your phone, sign-up to our newsletter and learn where to find us on online.
Commentaries, clips and podcasts
Enjoy the best debate, analysis and interviews with BBC 5 live and World Service plus our rugby union commentary listings.
What's on BBC Sport this week
This week's sport on the BBC includes the World Aquatic Championships, England v South Africa in the third Test and the Challenge Cup semi-finals.