Penisini attended Quakers Hill East Public School from Kindergarten to Year 6, winning many sporting accolades and becoming a popular figure among his peers and teachers for his sporting prowess, particularly in rugby league and union. He first attended Patrician Brothers' College, Blacktown and then transferred at the end of year 7 to The King's School, Parramatta. While at King's, he was a member of the premiership winning First XV rugby union team in 2018 and captain of the undefeated First XV rugby union team in 2020.
In 2016, at the age of 14, Penisini joined Parramatta Eels' junior development squad.
Playing career
2019 & 2020
Penisini played for Parramatta's SG Ball and Jersey Flegg teams in 2019 and 2020. Representing the NSW under 16s and 18s teams in 2018 and 2019, breaking his ankle in the under 18s game. Due to COVID-19, Penisini played for King's XV rugby union team.
2021
Penisini started 2021 training with Parramatta's first grade team, on March 4, 2021, Penisini was upgraded to the club's 30 man squad signing with Parramatta until the end of 2022. Penisini later re-signed with Parramatta for a further season until 2023. In round 19 2021, Penisini made his NRL debut for Parramatta against the Canberra Raiders in a 12–10 loss at Cbus Super Stadium on the Gold Coast.[2] In round 23, he scored his first try in the NRL during a 32–16 victory over North Queensland side.[3]
On 31 January, Penisini signed a two-year contract extension to remain at Parramatta until the end of the 2025 season.[10]
In round 1 of the 2023 NRL season, he scored the first try of the year in Parramatta's golden point extra-time loss to Melbourne.[11]
In round 5 of the 2023 NRL season, Penisini was sent to the sin bin for a professional foul during Parramatta's 28-20 loss to the Sydney Roosters.[12]
In round 17, Penisini scored two tries for Parramatta in their 48-20 victory over the Dolphins.[13]
Penisini played a total of 24 matches for Parramatta in the 2023 NRL season as the club finished 10th and missed the finals.[14]
2024
Penisini played 23 games for Parramatta in the 2024 NRL season and scored ten tries as the club finished 15th on the table.[15]