Sullivan, 14, joined the Union Academy in 2020 and has quickly progressed through the Pro Player Pathway. He has featured for Union Academy’s U15 MLS NEXT team, U17 MLS NEXT team, and Philadelphia Union II MLS NEXT Pro team, making a name for himself both with the Academy, as well as with United States Youth National Teams. In the 2023 Generation adidas Cup, Sullivan, who was just 13 years old at the time, helped the Union U15 squad reach the finals, beating academy powerhouses such as Valencia, Arsenal, and Real Madrid, with Sullivan scoring one minute into the match against Arsenal. With his outstanding play, he was named to the tournament’s Best XI. This year, Sullivan joined the U17 squad where he contributed to the team winning their second-consecutive GA Cup championship. Additionally, in 2024 Sullivan featured for Union II, where he’s appeared twice and added an assist in the game winning goal against New England Revolution II.
Last year Sullivan led the US to victory in the 2023 Concacaf Boy’s Under-15 Championship, marking the first time the US has ever won the tournament. The youngest player on the team, Sullivan’s four goals scored earned him the Golden Ball as the best player in the tournament.
