The man, who is understood to be 23 years old, sustained suspected spinal injuries in a minor fall.
He was taken from the island to Burtonport by the Arranmore Lifeboat.
It is understood the man was working renovating a house on the small island at the time.
He was then transferred from there by ambulance to the Dungloe GAA pitch where an Irish Coast Guard chopper from Shannon removed him to Letterkenny General.
He was brought to Letterkenny General Hospital just before 2.15pm where his injuries are now being assessed.
Meanwhile, a Dublin based Irish Coast Guard chopper is currently on route to retrieve an injured man aboard a Norwegian vessel at the Corrib Gas Field.