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The 23-year-old joins the Knights from Wynnum Manly Seagulls (2023-2024) and has previously made appearances for Cronulla Sharks (2022) and Ipswitch Jets (2019).
In 2018, Martin made one appearance for the Queensland U19s.
As a young and upcoming prop forward, Martin has made 32 appearances in the Queensland Cup and two appearances in the New South Wales Cup in the Reserve Grade.
On joining the Knights, Martin said:
"I'm excited to be over here this time of year and hopefully I'll help the boys charge towards the finals.
"I wanted to get out of my comfort zone. I was comfortable in Queensland and I wanted to step outside that and be comfortable being uncomfortable."
"Winning the comp is a massive one obviously and getting back into Super League with the boys and giving that a real crack."
"For me personally I want to have a good connection with all of our middles and be a force to be reckoned with and let the outside backs do their thing.
Chairman Clint GoodChild said:
"Jack coming in at this time in the season will be a jolt of fresh energy.
"He's a young man with big aspirations and a respectable resume having represented the Queensland U19s.
"He will be a big part of the make up of the squad moving forward this season and next."
York Knights return to the LNER Community Stadium to take on Dewsbury Rams in the Betfred Championship on Sunday (3pm)!
It's a double header with York Valkyrie v Huddersfield Giants in the Betfred Women's Super League (noon)!
Sunday is also Bluelight Heroes day and York RLFC are offering £5 Tickets to all NHS Staff, Police, Fire, Ambulance and Lifeboat Service Staff as well as Social Care staff to thank them for all of their work in supporting the community.
To access £5 Tickets please fill in the form here with the relevant Bluelight Light Card or Staff Card present.
General Admission tickets are priced at £20 for Adults, £15 for Concessions (17-to-21-year-olds and over-65s) and FREE for Under-16s! To purchase your tickets online, clickHERE!