Signing for St. Helens from amateur side Blackbrook ARLFC, Johnson plays as either a prop or second-row.
[5] Johnson made his first grade début for St Helens in 2010's Super League XV, coming off the bench to play second-row in a 30–22 win at home to the Huddersfield Giants.
Johnson made his début in the Festive Trophy on New Years Day, when Wakefield Trinity Wildcats lost 22–40 to Leeds Rhinos.
On 7 October 2013, it was announced that Johnson would be signing for the Widnes Vikings on a one-year contract after securing an early release from Hull FC.
[7][8] On 11 February 2015 Johnson and fellow Vikings teammate Grant Gore was loaned to Whitehaven on a one-month deal.