The Ulster Club Senior Football Championship kicked off on Halloween night before moving into its decisive phase.
Four quarter-final matches are scheduled for play across Derry and surrounding areas.
Scotstown enter the competition as reigning champions having secured the Seamus McFerran Cup in 2025.
The Loughgall-based side will attempt to defend their provincial title against opposition this Sunday.
Elsewhere, several established clubs from the Ulster scene are preparing to challenge for a place in the final.
Edendork have just eight days to convert their first-ever Tyrone senior title into a provincial campaign.
They faced an unfamiliar environment after defeating Clonduff in Newry last week.
St Brigid's from Antrim represent another quick turnaround story in the tournament.
The Ballymena side claimed their first Antrim senior title just three weeks prior to this fixture.
They will host Edendork in what promises to be a clash between two new boys in the provincial scene.
Letterkenny manager Donnelly stepped down as county representative last year before joining his native club.
His move helped Letterkenny regain the county title they held in 2024 after previous disappointments.
The Derry side lost deciders in 2015, 2018 and 2023 before finally securing their fifth provincial success.
St Gall's previously overcame Tempo in a quarter-final during 2012 to reach this stage.
Cargin's victory on penalties against Glenties in 2022 remains the only win for an Antrim club at this level.
By close of play on Sunday, eight hopefuls will be reduced to four finalists.
BBC Sport NI provides coverage of all quarter-final fixtures taking place in Derry.
The tournament continues to showcase emerging talent alongside experienced provincial regulars.