McCarron and McMahon doubtful for Tyrone’s Championship opener with Derry

Tyrone will begin the defence of their Ulster title on Sunday week when they play Derry and manager Mickey Harte has injury concerns ahead of the game,
Cathal McCarron and Justin McMahon are rated doubtful for the Ulster Champions visit to Celtic Park.
McCarron has a hamsting problem and McMahon is struggling to shake off a quad injury.