In 2012, Pritchard played for the Parramatta Eels' NYC team.
2013
In Round 8, Pritchard made his NRL debut for the Eels against the North Queensland Cowboys. On 5 July, he re-signed with the Eels on a 2-year contract.
2014
On 3 May, Pritchard played for the New South Wales Under-20s team against the Queensland Under-20s team. On 8 September, he was named in the Samoa train-on squad for the 2014 Four Nations, but didn't make the final 24-man squad.
2015
On 14 May 2015, it was revealed that Kaysa Pritchard let fellow Parramatta player Kenny Edwards take a urine sample for Pritchard on his behalf. Pritchard was temporarily stood down by the club. On 11 July, Pritchard re-signed with the Eels on a 1-year contract.
2016
On 26 February, Pritchard re-signed with the Eels on a 2-year contract. On 7 May, he made his international debut for Samoa against Tonga in the 2016 Polynesian Cup. Later in the year he represented Samoa in their historical test match against Fiji in Apia.
2017
Pritchard started the 2017 season at hooker for Parramatta in Round 1. He went on to play a further 15 games before suffering a season-ending knee injury against The St George Dragons. After being ruled out for the season, Pritchard made a shock return to The Parramatta side in their elimination final loss to North Queensland.
2018
On 29 April 2018, Pritchard was awarded the anzac medal for being voted best player on ground in Parramatta's 24-22 victory over The Wests Tigers. In Round 10, Pritchard suffered a groin injury in the match against Canterbury and was ruled out for 3–4 weeks. On 19 July, Pritchard scored a try in Parramatta's 14-8 victory over arch rivals Canterbury in which the media dubbed the match the "spoon bowl" as both sides were sitting last and second last on the table. On 28 July, Pritchard was ruled out for the rest of the season after suffering a dislocated shoulder in Parramatta's 26-20 loss to South Sydney. In total, Pritchard only managed to feature in 8 games for Parramatta in season 2018 as the club endured a horror year on and off the field claiming its 14th wooden spoon and Pritchard's second wooden spoon as a player since he joined The Eels in 2013. On 30 October 2018, Pritchard signed a one year contract extension to stay at Parramatta until the end of the 2019 season.
2019
In February, Pritchard was granted indefinite leave by Parramatta after the player declared that he was struggling to recover from an ongoing injury suffered from the 2018 season. On 14 June, Pritchard announced his retirement as a player.
