Munster Academy Year: One
School: Rockwell College
Club: UL Bohemians
Honours: Ireland U18 Schools 2012; Ireland U19 2013; Munster U19 2012; Munster U20 2013
Johston was a member of the Rockwell squad that won the 2012 Munster School's Senior Cup title.
The same year he represented Ireland U18 Schools in the 2012 FIRA/AER European Championship in Spain where Ireland came second. The side also included his academy colleagues Gearoid Lyons and Greg O'Shea.
The Clonmel man represented Munster U19s in the 2012/13 Interprovincial series and then represented Ireland U19s in April 2013 against England and France.
He makes the move from the sub academy to the academy for season 2013/14.
Played for Munster U20s in the Interprovincial campaign in September 2013.
Following the campaign Johnston was selected to take part in the IRFU training camp for Under 20s.