Just 60 of the 280 junior doctors recruited from India and Pakistan to ease the manpower crisis in hospitals have secured the green light to work.
The rest are awaiting clearance to take up their posts because of delays in registration.
It's not clear what proportion of the doctors recruited for Letterkenny General Hospital have taken up their posts.
According to an RTE reports there have been delays in registration with the Medical Council due to doctors not supplying supporting documentation, and also delays in provision of other material by the the HSE itself.
The HSE must supply declarations for the doctors, confirming they have been offered a specific post, provide a copy of their contract, and confirm that they will be supervised.
The Medical Council says these have been supplied in half of the cases.
The HSE says the registration process is complex and that the Medical Council amended the required HSE documentation in late August. However, the executive said that vacancy levels will reduce significantly as the doctors are registered and become available for work.
Letterkenny General Hospital has already indicated that these new recruits will be crucial in maintaining services, particularly in the Emergency Department.
The HSE has been accommodating the doctors for the past number of weeks while they await clearance to take up their posts.