Hayes missed last week’s defeat to Celtic in Glasgow to attend the birth of his first child.
The Dons will be without defender Clark Robertson, as he struggles with a thigh problem.
Aberdeen captain Russell Anderson is definitely ruled out as the defender recovers from a knee injury.
Ross County manager Jim McIntyre has confirmed he will again be without Uros Celcer and Steven Saunders for Saturday’s game.
Celcer was suspended for last week’s 2-1 defeat to Motherwell but the Staggies defender has now picked up a hamstring injury.
Fellow defender Saunders is still troubled with an ankle complaint and has no chance of playing.
Tim Dreesen (back) is back in training, meanwhile, but the Staggies boss is unsure if the defender will be fit enough to face the Dons.
County make the trip to Pittodrie looking for their first point of the campaign.