[6] Umaga was originally a member of the Leicester Tigers academy but left to join Wasps at the age of eighteen.

[7] He represented Hinckley RFC in National League 2 North during the 2016–17 campaign scoring five tries in eleven appearances, including an individual try at Preston Grasshoppers.

[4] In October 2020 Umaga scored a try for Wasps as they lost to Exeter Chiefs in the Premiership final to finish runners up.

[12][13] Later that year he started for the side that finished runners up to New Zealand in the final of the 2017 World Rugby Under 20 Championship.

[14] In January 2020 Umaga received his first call-up to the senior England squad by coach Eddie Jones for the 2020 Six Nations Championship.