Tyrone manager Mickey Harte has revealed that they could be without defender Cathal McCarron for the Ulster quarter-final against Derry in Celtic Park on May 28.
"He picked up a bit of a hamstring injury, which is concerning for us too because it only happened a week ago," said Harte of the Dromore man.
"He thinks it's not too bad, but we have a lot of experience with hamstring injuries by this stage. What can be considered 'not too bad' could be three or four weeks of trouble."
Harte also paid warm tribute to the retired Joe McMahon, who walked away from the panel this week after failing to regain his fitness to return to county football.
"He was always a very comfortable player, right from I saw him at minor level," enthused Harte.
"He was good on the ball, could turn either way, kick off either foot, he could shoot, defend.
"He had so much going for him and he tried very hard to get back from injury.
"But the more he tried it seemed to be that it was not working for him so he had to make that call.
"With not being able to fully train with us at this stage of the year, it was always going to be an uphill battle for him."