Club Molloy has had great success with his club Naomh Conaill, winning Championships at under-age level and then the Donegal Senior Football Championship. He first encountered McGuinness while with his club and first played under him in 2009, a year in which reached the final of the Donegal Senior Football Championship, but lost. He played for his club in the final of the
2015 Donegal Senior Football Championship. His club won. He made a substitute appearance for his club in the final of the
2019 Donegal Senior Football Championship. After the first two games finished level, his club won the third game and, with that, the title, Molloy appearing as a substitute in all three games, scoring two points in the second game and no points in the other first and third games. He made a substitute appearance for his club in the final of the
2020 Donegal Senior Football Championship. His club won, following extra-time and a penalty shoot-out. He missed his club's 2022
Comórtas Peile na Gaeltachta Donegal Senior semi-final and final wins as they coincided with his
stag party. Then he made a substitute appearance for his club in the final of the
2022 Donegal Senior Football Championship. His club won. He also had a role in his club's
2023 Donegal Senior Football Championship title win. Though he did not play in the final. Molloy played for his club in the
2025 Donegal SFC, when his club won the final again, with Molloy making a substitute appearance in that game.
Inter-county Minor Molloy played minor inter-county football for Donegal in 2008 and 2009.
Under-21 Molloy played for the under-21 footballers in 2010, 2011 and 2012, and
captained the team in 2012. He played for Donegal in the 2010
Ulster Under-21 Football Championship campaign, contributing six points (including three frees) to the team's three-point quarter-final victory over
Armagh, three points (all frees) to the team's four-point semi-final victory over
Derry and to the team's comprehensive final victory over
Cavan, with all three games played at neutral
Brewster Park. He then played in the final of the
2010 All-Ireland Under-21 Football Championship, which Donegal (managed by
Jim McGuinness) narrowly lost to
Dublin (managed by
Jim Gavin), though Molloy scored five points (including four frees).
Senior Following the 2010 All-Ireland Under-21 Football Championship final loss, and while returning home to
Galway (where he lived with
Leo McLoone at the time), Molloy received word that he had been called into the senior county team. He was an injury doubt ahead of the
2011 All-Ireland Senior Football Championship quarter-final against
Kildare. He was a member of the Donegal panel that won the
2012 All-Ireland Senior Football Championship final against
Mayo, coming on as a substitute for
Martin McElhinney in injury time in the second half. Molloy started
Rory Gallagher's first match in charge of the county, a
2015 Dr McKenna Cup away defeat to
Derry. He left the team later that month, ahead of the start of the
2015 National Football League. ==Honours==