Tyrone's 1-15 to 0-13 defeat by Louth leaves them three points from safety in the drop zone. O'Rourke expressed concern over Canavan's departure for a month in Australia but insists the squad has the character to cope.
The Red Hands host bottom-placed Offaly on Saturday, with O'Rourke predicting a 'massive battle' against the team managed by Mickey Harte.