Fitzgerald made his debut for Munster on 13 September 2015, starting in the second game of the 2015–16 Pro12 against Ospreys and scoring a try. On 1 June 2017, it was announced that Fitzgerald had been promoted to the senior Munster squad ahead of the 2017–18 season. He signed a one-year development contract extension with Munster in February 2018.