Prendergast joined the Connacht academy in summer 2020. The following October he made his senior debut in Round 3 of the 2020–21 Pro14 against Edinburgh. In March 2021, Connacht announced that he had signed a professional contract with the club. In May 2022, and with one year on his deal still to run, Connacht announced a new longer term contract to keep him at the club until 2025.
