Dunster graduated from Parramatta's Jersey Flegg team in the Intrust Super Premiership with the
Wentworthville Magpies. In 2019, Dunster re-signed with Parramatta until the end of the 2020 season. Dunster appeared in the 2019 Intrust Super Premiership grand final loss, against
Newtown.
2020 Dunster began the year in the Eels 30 man squad, appearing as 18th man twice. Dunster made his
NRL debut in week two of the finals of the
2020 NRL season for Parramatta against
South Sydney, in a 38–24 loss at
Bankwest Stadium, after being called into the team to play on gameday after
Michael Jennings tested positive to drugs.
2021 In round 13 of the
2021 NRL season, Dunster scored his first try in the top grade as Parramatta defeated Newcastle 40–4. Dunster finished the
2021 NRL season with 13 appearances scoring three tries. He played in both finals matches against
Newcastle and
Penrith as the club bowed out of the finals at the second week for the third consecutive season. In September, he was named Parramatta's Rookie of the year. In December, Dunster signed a new deal with Parramatta to remain at the club until the end of the 2025 season.
2022 On 20 February, Dunster's
2022 NRL season was ended in Parramatta's first trial match of the year against
St. George Illawarra. Dunster was on the receiving end of a hip-drop tackle from opponent
Tyrell Fuimaono which tore his ACL, PCL and MCL, thus ruling him out for the entire year.
2023 In round 6 of the
2023 NRL season, Dunster made his long-awaited return to the Parramatta side in their 28–22 victory over the hapless
Wests Tigers. Following Parramatta's round 11 loss against Canberra, Dunster was demoted to reserve grade in favour of
Sean Russell. Dunster was limited to only five matches for Parramatta in the
2023 NRL season as the club finished 10th on the table. Dunster would instead spend most of the year with the clubs NSW Cup team.
2024 Dunster started the year in Parramatta's reserve grade team after falling down the pecking order behind the likes of Sean Russell,
Morgan Harper and
Maika Sivo. On 4 April, it was announced that Dunster would miss at least three months with a foot injury.
2025 On 2 September, it was announced that Dunster had suffered another ACL injury whilst playing for Parramatta in the NSW Cup and would require surgery ruling him out for an indefinite period. Dunster made no appearances for Parramatta's first grade team in the
2025 NRL season. In early September, it was announced that Dunster would be departing Parramatta after not being offered a new contract. ==References==