Back row forward Clive Ross, lock Alan O'Connor, and scrum-half Dave Shanahan have all signed contract extensions that will keep them at Ulster Rugby until the summer of 2019, while hooker John Andrew has agreed terms to stay with the Province until 2020.
Commenting on the announcement of the contract extensions, Director of Rugby Les Kiss said:
"We are delighted that the four boys have committed their immediate future to Ulster. As we continue to build our playing roster it is critical that we have depth across these key positions, so this is another important piece of business for us.
"All four of the guys have a great work ethic and a genuine eagerness to develop their game, so I have no doubt that they will continue to be key components of our squad for the years ahead.”