The move has been made at the request of management.
Offaly's tie with Down in Division 2A of the Allianz National Hurling League has been switched to O'Connor Park.
It was due to be played in St. Brendan's Park in Birr on Sunday but has been changed at the request of manager Michael Fennelly.
Fennelly was quick to stress that they're happy to play games in South Offaly but wanted to avail of more spacious dressing rooms and familiar settings in Tullamore for a crunch game.
The Faithful will have a full panel to choose from ahead of the crunch game at the top of the table.