Alun Wyn Jones has ended speculation over his future by signing a two-year contract extension at Ospreys.
Ross Ford, Scotland's most-capped player and former British and Irish Lions hooker, has announced his retirement from rugby.
Edinburgh have signed South African scrum-half Nic Groom from Super Rugby side Lions.
Saracens will face Munster, Racing 92 and the Ospreys in next season's Champions Cup while Stuart Hogg returns to Glasgow.
Edinburgh hope to have unearthed another Fijian star after signing forward Mesulame Kunavula on a long-term deal.
Leicester Tigers have been drawn with former winners Cardiff Blues and Pau in next season's European Challenge Cup.
Munster have appointed former Australia fly-half Stephen Larkham as a senior coach until June 2022.
Munster have confirmed former England prop Graham Rowntree as their new forwards coach until June 2022.
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