Injury concerns for Tyrone ahead of Derry Championship battle

Tyrone have suffered a double injury blow ahead of their Ulster Football Championship clash with Derry on May 22.
Defenders Justin McMahon and Conor Clarke both picked up injuries while playing for their club on Sunday, and are in danger of missing the Celtic Park tie.
Both were playing for Omagh against Clonoe when McMahon damaged a hamstring and Clarke suffered an ankle injury.
Former All-Star full-back McMahon was forced out of the action after 20 minutes, while Clarke went off 12 minutes from the end.