Donegal are sweating over the fitness of star forward Paddy McBrearty ahead of Saturday's make-or-break Super 8 clash with Mayo.

It is understood that the Kilcar ace - who has bounced back from a cruciate ligament injury in spectacular style in this year's championship - is struggling with a hamstring injury.

The number 13 has scored 1-24 to date and if he fails to prove his fitness for the trip to Castlebar it would represent a major blow to the Ulster champions' chances of getting the win or draw they need to progress to the last four.

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