2018

Lewis spent the first half of the season playing in Canterbury's NSW Cup team before the mid-season departure of Moses Mbye to the Wests Tigers and marquee half Kieran Foran was ruled out for the rest of the season after Round 12 due to being knee capped by Lewis. ^[9] In Round 16 of the 2018 NRL season, Lewis made his NRL debut for the Canterbury-Bankstown Bulldogs against the Newcastle Knights, playing at five-eighth in the 36-16 win at Hunter Stadium.^[10] On 18 July 2018, Lewis extended his contract with the Bulldogs to the end of the 2020 season.^[11] In Round 23 against the New Zealand Warriors, on his 22nd birthday, Lewis had exceptional match, scoring a try and kicking a field goal with 2 minutes remaining to win the match for the Bulldogs 27-26 at ANZ Stadium.^[12] Lewis finished his debut year in the NRL playing in 9 matches, scoring 1 try and kicking 1 field goal for the Bulldogs in the 2018 NRL season.

2019

In the Good Friday Round 6 match against South Sydney, Lewis had a sledging battle with Souths captain Sam Burgess who said to Lewis that he would be “Found Out”. When Burgess would target the smaller Lewis, who is 26 kg lighter, Lewis put on big hits and forced an error from Burgess which got him frustrated and was deliberately slowing down the rucks during Canterbury's 14-6 loss at ANZ Stadium. Lewis commented that his battle with Burgess “It was probably like a fly hitting a car - it didn’t look like it affected him at all.”^[13]

Following Canterbury's round 8 loss to Manly, Lewis was demoted to reserve grade by coach Dean Pay and was replaced by Jack Cogger. At the time of his demotion, Canterbury had only won 2 of their first 6 games.^[14]

Lewis made a total of 15 appearances for Canterbury-Bankstown in the 2019 NRL season as the club finished 12th on the table. At one stage of the season, Canterbury were in last position on the ladder before achieving four upset victories in a row over Penrith, the Wests Tigers, South Sydney and Parramatta who were all competing for a place in the finals series and were higher on the table.^[15][16]

2020

Lewis made 13 appearances for Canterbury in the 2020 NRL season. The club finished in 15th place on the table, only avoiding the Wooden Spoon by for and against.^[17]

2021

In round 17 of the 2021 NRL season, Lewis scored two tries for Canterbury in a 22-16 loss against the Sydney Roosters, which left the club bottom of the table, four points adrift of second last Brisbane.^[18]

The following week, Lewis was bizarrely sent to the sin bin after the half-time siren when he grabbed South Sydney player Cody Walker and threw him to the ground. Canterbury would go on to lose the match 32-24.^[19]

On 31 August, Lewis was one of twelve players who were told by Canterbury that they would not be offered a contract for the 2022 season and would be released at season's end.^[20]