He has spent time on loan from Hull KR at the York City Knights and the Bradford Bulls in the Championship, and on dual registration from Castleford at the Midlands Hurricanes in League 1.
[11] In April 2021, shortly following a recall from his loan move to Bradford, Wallis departed Hull KR by mutual consent.
[16] He featured in the Bulls' pre-season friendlies against Swinton and Keighley, but departed the club on 15 April 2021 without making a competitive appearance.
[22] In November, the Tigers announced that Wallis would be promoted to the first team in 2023 after signing a one-year professional contract with the option of a further year.
[25] He scored his first try for the Tigers at the 2023 Magic Weekend against the Leeds Rhinos, showing "pace and precision to keep himself inside the chalk," by beating two defenders down the touchline.
[30] The mid-season departure of fellow winger Bureta Faraimo afforded Wallis a consistent place in the starting line-up, featuring in every game throughout July and August.
[3] Having previously represented the club under its former name Coventry, Wallis featured for the Midlands Hurricanes in League 1 during the 2022 season through their dual registration agreement with Castleford.