Goalkeeper Michael Boyle is set to miss the rest of Donegal's All-Ireland senior football championship campaign.
The Termon goalkeeper, who has been understudy to Paul Durcan for several years, is heading to America.
He is set to join up with the Donegal GAA set-up in Boston.
Meanwhile, Derry's attacking options have been dented ahead of next Saturday’s Ulster SFC semi-final clash with Donegal by the news that James Kielt has left the panel.
The Kilrea forward is understood to have been disappointed by his lack of game time in the victory over Down at the start of June.
He was overlooked on the bench as Brian McIver brought in Cailean O’Boyle and Terence O’Brien as second half substitutes ahead of him.
The absence of Kielt will be a particular disappointment to Derry given his ability to kick scores from distance as they try to plan their way around Donegal’s massed defence, which they’ll encounter for the fourth time in five championship seasons on June 27.
Kielt was a key member of the Oak Leaf minor side that reached the All-Ireland final in 2007 and made his championship debut two years later, scoring two points in victory over Monaghan at Celtic Park.
However, he accumulated only 101 minutes of Ulster championship action in the subsequent years, completing only the 2013 defeat by Down, in which he scored five points.
Derry have also lost Daniel McKinless, who is likely to be sidelined for the rest of the year. The Ballinderry forward fractured the fibula, tibia, patella and suffered a torn Medial Collateral Ligament during a club game last week.
If you have a story or want to send a photo or video to us please contact the Donegal Now editorial team. Between 9am and 5pm Monday to Sunday please call 074 9112712. Between 5pm and midnight please call or text 086 792 2103. Or you can email [email protected] at any time.