He is the only Sikh to have played professional rugby.[3] His performances for Harlequins particularly impressed club coach Dean Richards in 2007.[4]
In 2010 he was nominated for British Asian Sports Personality of the year, and underwent ankle surgery even though he was out of contract in the summer.[5] He was released by Harlequins and then completed a degree at Bath University. In 2014 Masson was signed by Rosslyn Park F.C. to play in National League 1.[6]