Kay signed a professional contract at Wakefield Trinity Wildcats in 2012 as a halfback but was mostly played on the wing. He scored 7 tries for the Wakefield Trinity Wildcats in 5 appearances. In 2013 he was sent on dual registration to Doncaster where he played at both halfback but mostly on the wing as he had done at Wakefield. He scored 12 tries in 21 appearances for Doncaster before he returned to Wakefield where a hat-trick of tries against Castleford Tigers in the closing game of the 2013 season.[citation needed]
Leigh
Kay signed for Championship side Leigh in 2014 where he played as a wing. In his first season with the club, they finished top of the league and won the Grand Final against Featherstone Rovers to win the Championship for the first time since 2004. In 2015 Kay equalled the record for most tries in a season by a Leigh wing which was 36 as the Leigh Centurions again won the Championship title.[citation needed]
Toronto
Kay was the first-ever signing to play for the newly formed Canadian club, Toronto Wolfpack, for their inaugural season in 2017. Kay ended that season as the division's top try scorer. He was also named in the Ireland squad for the 2017 Rugby League World Cup.[6]
In 2018 again Toronto Wolfpack would finish top of the championship and would enter the playoffs for a chance for promotion. Unfortunately Kay suffered an extremely complex injury in the first week of the play-offs, unfortunately that wasn't the first of the bad news for Toronto Wolfpack as they would later fail to reach the Super league losing to London Broncos In the Million Pound Game.
In 2019 Kay would miss the first few games due to the injury he sustained in August 2018. But he made his return on Canadian soil against Bradford Bulls. Again Toronto Wolfpack would finish top of the table and at last gain promotion to Super League with Kay firmly in the mix.
Wakefield (II)
On 16 July 2020, Kay was loaned to Wakefield Trinity from the Toronto Wolfpack for the remainder of the 2020 Super League season, while also signing a two-year deal with the Trinity for 2021 & 2022.[7]
Kay played 25 games for Wakefield Trinity in the Super League XXVIII season as the club finished bottom of the table and were relegated to the RFL Championship which ended their 24-year stay in the top flight.[8]
