Quade Cooper will be out of action for three months after fracturing a collarbone during training.
Australia scrum-half Nic White will join Top 14 club Montpellier next season.
London Irish have signed New Zealand World Cup winner Ben Franks.
Former New Zealand international Ali Williams has announced he is to retire from rugby at the end of the season.
New Zealand lock Jeremy Thrush will join Aviva Premiership side Gloucester after the 2015 Rugby World Cup.
Sale Sharks have signed Samoa international flanker TJ Ioane for the rest of the season.
Australia scrum-half Nick Phipps has signed a two-year contract extension with the Australian Rugby Union.
Teams from Argentina and Japan will compete in Super Rugby from the start of the 2016 season, SANZAR has confirmed.
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