Fijian back row Senitiki Nayalo joins Championship club London Irish on a two-year deal following a trial in pre-season.
London Irish hooker Tom Cruse agrees a deal to join Premiership rivals Wasps at the end of the season.
Jerry Sexton signs a permanent contract with London Irish following a loan spell from Exeter Chiefs last season.
Full-back Ben Ransom joins Championship club London Irish from Premiership and European champions Saracens.
London Irish and Samoa back row Ofisa Treviranus extends his contract with the Championship club by two years.