Gloucester announced the signing of 30-year-old New Zealand born former Wallabies hooker Huia Edmonds.
Edmonds, who was capped by the Wallabies at schoolboy, Under 19, Under 21 and senior level, missed the 2011 World Cup only due to a foot injury; he played Super Rugby for the Waratahs, the Stormers and the Brumbies.
Bath signed 26-year-old Scarlets lock Dominic Day.
Day has played 97 games for the Llanelli-based franchise and is confident to reach 100 before moving to England.
London Irish signed on a two-year contract 26-year-old back rower Tom Smith from the Ospreys.
Smith, who skippered Wales Under 21s and the Ospreys, played 60 games (2 tries) for the Welsh franchise.