Watson started his career at
London Irish in 2009, where he came through the club's academy. He only made six first team appearances before moving to Saracens in 2011. Watson never made a competitive first team appearance for Saracens but did help them win the JP Morgan Premiership Sevens. Watson transitioned back to 15-a-side when he signed with
Newcastle Falcons after three years with England Sevens in February 2015. He was awarded the team's player of the month in November 2017. On 22 February 2017, Watson signed for Premiership rivals
Wasps in the
English Premiership ahead of the 2017-18 season. He played for
Benetton in the
United Rugby Championship from 2022 to
2023–24 United Rugby Championship season. ==International career==