England internationals Billy and Mako Vunipola have signed new four-year contracts with Saracens.
Bristol return to rugby's top flight by launching the new 2018-2019 Premiership season against rivals Bath.
Saracens coach Alex Sanderson thinks Billy Vunipola will come back stronger from his latest injury setback and could peak at the 2019 World Cup.
Holders Leinster have been drawn against Wasps, Toulouse and Bath in Pool One in next season's Champions Cup.
Owen Farrell has called on England to remain calm when they attempt to level the three-Test series against South Africa on Saturday.
South Africa have added 'retired' former Saracens hooker Schalk Brits to their squad for the second Test against England.
Saracens duo George Kruis and Vincent Koch have signed new deals with the Premiership champions.
Saracens director of rugby Mark McCall has signed a new deal at Allianz Park just three days after leading them to the Aviva Premiership title.
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