Career
The former Ardscoil Rís student plays his club football for Whitehall Colmcille. In 2014, he was a sub in the quarter-final victory over Laois in the Leinster Senior Championship. He scored three points in the game.
During the semi-final victory over Wexford he was a sub again and he scored 1-05.
He was a sub and scored one point in the game. In the All-Ireland quarter-final Costello was a sub again and managed one point in a one-sided game against Monaghan.
He was selected at corner forward against Donegal but Dublin crashed out in the semi-final.