[2] In his junior year of high school, he led the Massapequa Chiefs to a NYSPHSAA Class AA Championship.
He is the younger brother of former Georgetown Hoyas, Long Island Rough Riders and New York Cosmos defender, Jimmy Nealis.
Nealis' younger brother, Dylan, was a member of the Georgetown Men's Soccer National Championship Team in 2019 and was drafted third overall by Inter Miami in the 2020 MLS SuperDraft.
[6] On February 27, 2019, Nealis made his professional and New York Red Bulls debut coming on in the second half for Aaron Long in 3–0 victory over Atlético Pantoja in the 2019 CONCACAF Champions League.
[7] A few days later, on March 2, 2019, Nealis made his league debut with the club, appearing in a 1–1 draw with Columbus Crew.