Premiership champions Exeter will begin their title defence at Gloucester when the 2017-18 season starts on 1 September.
Flanker Lachlan McCaffrey leaves Leicester Tigers after two years with the Premiership club.
Premiership side Leicester Tigers complete the signings of versatile backs Nick Malouf and Gareth Owen.
South Africa winger JP Pietersen is leaving Leicester Tigers after one season at Welford Road to join Toulon.
Audio & Video
Former England rugby union captain Mike Tindall is in awe of Matt Hampson's tireless charity work since Hampson was left paralysed in 2005.
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.
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What's on BBC Sport this week
This week's sport on the BBC includes The Open, the conclusion of the Women's Cricket World Cup and action from the World Para-athletics Championships in London