Ulster have signed London Welsh duo Peter Browne and Paul Rowley.
Former Newcastle Falcons and Harlequins lock Browne, 27, has played for England Students but is Irish qualified.
Scrum-half Rowley, 25, started his career with Munster before moving to Plymouth Albion.
He joined Premiership strugglers London Welsh at the start of this season. The Exiles have already had their relegation confirmed after losing all 18 of their games so far.
Ulster team manager Bryn Cunningham said: "As we continue to search for Irish-qualified talent that can add competition to our current squad, I am pleased with the recruitment of both Pete and Paul.
"Pete's pedigree and age make him the perfect person to come into an environment that will encourage him to achieve his potential and result in him pushing hard for a starting berth as a six or second row.
"Paul possesses an all-round game with control being at the forefront of his skill set. He will aim to put pressure on Paul Marshall and provide a slightly different option with his left-footed kicking from behind the pack."