An England international representative centre, he made his Castleford Tigers debut in 2004 and played over 150 times for the club before transferring to St Helens in 2010.

Having played more than 300 games for the Tigers in all competitions, Shenton holds the club record for most Super League appearances after overtaking Danny Orr.

Shenton was a member of the England Elite Training Squad as well, alongside his former Castleford Tigers teammate Joe Westerman.

Tigers Head Coach David Woods said he was like NRL and Penrith Panthers Star Luke Lewis.

Shenton had many rugby league pundits talking about him after his performance in Castleford Tigers 80th anniversary game on 16 July, in which they defeated Leeds Rhinos 31–30.

[8] At the end of the season, Castleford were relegated and there were a lot of Super League clubs, including Wakefield Trinity Wildcats and Hull FC, chasing Shenton.

Shenton finished his time with the Tigers against his new club, St Helens, in their last league game at Knowsley Road.

[15] Shenton led out Castleford at the 2014 Challenge Cup Final defeat by the Leeds Rhinos at Wembley Stadium.

[17][18] Shenton was named in the Super League Dream Team for the second consecutive year at the end of the 2015 season.

[19] On 7 February 2016, Shenton was on the receiving end of a tackle by Hull KR's John Boudebza in the opening fixture of the Super League, sustaining an anterior cruciate ligament (ACL) knee injury.

Shenton also led out the Castleford team for the 2017 Super League Grand Final defeat by the Leeds Rhinos at Old Trafford.

[22][23][24] Shenton was named in the Super League Dream Team for the third time in his career at the end of the 2017 season.

[29] In 2010, Shenton played in the mid-season international against France on 12 June, scoring his 1st England try in their 60–6 victory at Leigh Sports Village.