Wolves' Matt Doherty is a doubt for Republic of Ireland duty after sustaining a face injury.
The full-back is seeing a specialist regarding the knock he received during the draw at Arsenal on Sunday.
Doherty, who has featured in all of Wolves' 12 Premier League games so far this season, did not train with the Republic of Ireland squad on Tuesday and is yet to meet with the squad.
They play Northern Ireland in a friendly on Thursday before the UEFA Nations League clash with Denmark next Monday. Both matches are live on Sky Sports.
Shane Long and Derrick Williams have already withdrawn from the squad due to injury.
Seamus Coleman is back in the Ireland set-up after missing their last three matches.
Since losing 5-1 on aggregate in the World Cup qualifying play-off to Denmark last year, Ireland's only taste of victory has come in a friendly against the USA back in June.