On 12 May 2017 Glasgow Warriors confirmed a 2-year signing of Masaga beginning for the 2017-18 season.
Masaga played his first match for the Warriors on 25 August 2017 coming on as a substitute against Dragons in a 40–23 away win.[4]
International career
Masaga was selected for the New Zealand U21 side for the 2006 Under 21 Rugby World Cup in France. Masaga was the top try scorer in the tournament with 7 tries.
The NZRU's controversial decision to 'recondition' established All Black test players including Chiefs anchors Sitiveni Sivivatu and Mils Muliaina allowed Masaga to cement his position in the side. Despite early losses in the 2007 season, coaches Ian Foster and Warren Gatland showed patience and trust in the young winger who has performed remarkably well, co-leading the tournament as top try scorer with 8 tries going into the last round. He was included in the All Blacks squad for the 2009 Iveco Series to cover for injuries when he earned his first test cap against Italy on 27 June 2009.[citation needed]