Bristol has signed Tonga international Sione Faletau and Edinburgh's Jack Cosgrove for next season.
Front row Faletau, 28, has three caps for his country and will join Mark Tainton's side from Yorkshire Carnegie.
Fellow prop Cosgrove, 22, is a former Scotland Under-20 international who is also eligible to play for England, and will arrive from the Pro 12 club.
"The Championship has some excellent players and Sione is in the prime of his career," said Bristol boss Tainton.
"Both players were impressed that there's a clear understanding about what we want to achieve, and they're eager to be a part of that."
Bristol is bottom of the Premiership, seven points from safety with five games remaining.
Photo: Sione Faletau only joined Yorkshire Carnegie in January from New Zealand side Counties Manukau