Donegal captain Paddy McBrearty is set to miss some crunch League games due to a hamstring injury sustained against Tyrone.
McBrearty kicked the winning point as Donegal opened the League campaign with a win over All-Ireland champions Kerry last month but he was withdrawn as they were well beaten in Omagh last time out.
They face bottom-of-the-table Monaghan in Clones on Sunday followed by Galway and Armagh in the two subsequent weekends in games that could define their League campaign.
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With talisman Michael Murphy having retired in November, Donegal boss Paddy Carr can ill-afford to lose another experienced member of his attack for a sustained period.
"He is being looked after by the medical people but at the moment it is highly unlikely that he will be available for Sunday unfortunately," Donegal manager Paddy Carr told Donegal Live.
