Maddocks made his debut for the Rebels against the
Blues as a starter in a 56–18 defeat for the Rebels, overcoming glandular fever to start the game. Maddocks was selected as one of two development players within the
Australian squad for the
2017 Wallabies tour. Jack Maddocks left Australia in June 2021 to join
Section Paloise, competing in the
Top 14, on a two-season contract. In his first match for Pau, he fractured his thumb and was sidelined for six weeks. Later, after playing only four matches and scoring a try against Union Bordeaux Bègles in his second game, he suffered a thigh injury in late October, causing him to miss the rest of the
2021–22 Top 14 season. His absence was due to a rare and complex injury involving hematoma calcification, which had also ended his father's career. Following a shortened first season due to his injury, Maddocks started the next season on the field against
ASM Clermont during the second round of the
2022–23 Top 14 season. In the third round, he played a significant role in Pau's victory against
Stade Toulousain by scoring two tries, earning him the
Midi Olympique Player of the Week award. He gradually asserted himself as a leader in Pau's attack, returning to the level that had earned him international recognition. Regaining his form, Jack Maddocks established himself as one of Pau's offensive leaders. In December 2022, Maddocks extended his contract with Pau for an additional two seasons. ==Super Rugby statistics==