London Welsh have signed Tristan Roberts, Nic Reynolds and Chris Elder ahead of their return to the Aviva Premiership.
Fly-half Roberts, 27, has joined the Exiles from Bristol, while 25-year-old centre Reynolds arrives from Scarlets.
Meanwhile, 21-year-old full-back Elder has left Plymouth Albion in order to play for the newly-promoted club.
London Welsh made the first of their summer signings on Monday when they brought in former England international fly-half Olly Barkley from Scarlets.