McMahon’s comeback from injury has been put on hold, and he failed to make an appearance for his club in any of the three league games played during April.
The Omagh man missed the entire National Football League campaign with a groin problem, and his recovery received a recent setback when he suffered a calf strain.
Midfielders Colm Cavanagh and Conan Grugan are also doubtful. The pair were due to face off in direct opposition last Sunday when Omagh played Moy, but both sat out the league game at HealyPark – Cavanagh with a leg injury and Grugan with a hamstring strain.
There’s better news on former All-Stars Justin McMahon and Stephen O’Neill, neither of whom have yet played for Tyrone this year.
McMahon has recovered from hamstring trouble, and has shown impressive form in Omagh’s three league games, while O’Neill, having recovered from surgery on an Achilles problem, made his first appearance in eight months when he came off the bench for Clann nan Gael last weekend.