At the international level, he represents Ireland U17. He plays primarily as a Forward. His preferred foot is Right. His current market value is estimated at 1000K €.

His most recent move was a Free from St. Patricks Athletic to Tottenham Hotspur U23 on 2026-01-01. The reported fee was 1.8M €.

In the UEFA European U21 Championship qualification 2025-2027 season, Mason Melia scored 2 goals and provided 0 assists across 5 appearances, averaging 0.4 goals per game with 3 shots attempted and 2 on target.