He has also represented England at international level, having made his test debut against Scotland during the 2023 Six Nations Championship.
where he was coached by his father prior to joining the academy of London Irish at the age of sixteen.
[3] On 27 October 2018 he scored a try on his club debut in a RFU Championship match against Cornish Pirates.
[2] In June 2021 Hassell-Collins received his first call-up by coach Eddie Jones to the senior squad for a training camp and he was called up again for the 2022 Six Nations Championship.
[7][8] He was included in the squad for the 2023 Six Nations Championship by new coach Steve Borthwick and on 4 February 2023 made his debut starting in their opening round defeat to Scotland.