Darron Gibson is a doubt for Ireland’s clash with Scotland next month in the Euro 2016 qualifiers.
The Everton player jarred his knee in training and is waiting to see how serious the damage is.
Gibson only recently returned from a long-term absence due to a cruciate injury.
O'Neill may have an issue with midfield even though Glen Whelan has been included in the squad but remains a doubt through injury.
Gibson’s Everton teammate Seamus Coleman is set to return to International duty in time for the Scotland game having made a full recovery from the hamstring injury which kept him out for a number of weeks.
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