Harriel appeared as an amateur player for USL Championship side Bethlehem Steel during their 2019 season, as well as being part of the Philadelphia Union academy.
[3][4] In 2019, Harriel verbally committed to play college soccer at Clemson University.
[5] However, on July 17, 2020, Harriel signed with Philadelphia Union as a homegrown player, beginning from the 2021 season.
[6] They acquired his homegrown rights from Orlando City SC in exchange for a first round 2021 MLS SuperDraft pick.
[8] Both players who had played in the position during the season, Olivier Mbaizo and Alvas Powell, were away on international duty.