Newcastle Falcons have signed Lyon prop Sami Mavinga and Jersey Reds flanker Gary Graham for next season.
Saracens kept in touch with Premiership leaders Wasps with a 35-27 victory over Newcastle.
Billy Vunipola has been named in the Saracens starting line-up for Sunday's Premiership trip to Newcastle.
Yorkshire Carnegie captain Ryan Burrows will join Newcastle Falcons next
season describing the club as an "attractive prospect".
Exeter maintained the pressure on Premiership leaders Wasps with a hard-fought 36-14 victory over Newcastle.
Aviva Premiership club Newcastle have signed Canada international wing DTH van der Merwe.
Wasps have announced Newcastle duo Marcus Watson and Ben Harris will join the club at the end of the season.
Newcastle Falcons have signed Fiji international Josh Matavesi and younger brother Joel Matavesi for the start of the 2017-18 season.
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