Mellett first appeared on the inter-county scene as a dual player at minor level in 1963.
Mellett was promoted to the senior team for a challenge game against Leitrim and was a member of the extended panel for the 1966 All-Ireland final defeat by Galway.
He made the starting fifteen the following year and was at left wing-forward for the defeat of Cork in the 1967 All-Ireland final.
[citation needed] Mellett was born Mícheál Ó Méalóid in Connemara, County Galway.
He moved to Ráth Chairn in the Meath Gaeltacht as a 10-year-old boy before settling in Dublin in 1973.