Blow for Northern Ireland as Will Grigg ruled out
The front man is still struggling with an ongoing ankle injury and has returned to his club Sunderland.
"It's a blow," said O'Neill on Wednesday. "Will has never really had a run for us. He's been carrying the ankle injury since January.
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Hide Ad"He stayed on the pitch last Saturday only because Sunderland had used their three subs.
"He wasn't going to be in contention tomorrow night and it was unrealistic to expect him to be ready for Sunday, so it was in his best interests to let him go back to his club.
"We have other options, but it is disappointing as in the Nations League, Will showed he's capable of scoring at this level."