After signing with the New Zealand Warriors, Gubb played for their Toyota Cup (Under-20s) team in 2010. He played in 23 games during the season and came off the bench in the 2010 Toyota Cup Grand Final, which was won by the Warriors 42–28.[5]
Gubb returned to Auckland in 2013 and trialled with the Warriors on a pre-season contract.[7] Gubb earned a full-time contract with the club and spent the first half of the year playing NSW Cup with the Auckland Vulcans. His contract was extended until the end of 2014 in June and, after several games as 18th man, Gubb was named to make his first grade debut for the Warriors on 7 July 2013 after Russell Packer withdrew due to injury.[8][9]
In 2018, Gubb joined the Canberra Raiders but halfway through the season signed with English club Leigh Centurions. On July 27, 2018, Gubb's move to Leigh fell through due to financial reasons, Gubb then signed a contract to join the Widnes Vikings instead.
On 4 March 2019, Gubb announced his retirement from Rugby League at the age of 28 to pursue a career as a teacher back in his home country of New Zealand. [10]