Republic of Ireland defender Joey O'Brien has been sent for a hamstring scan after suffering a problem before Friday's friendly win over Latvia.
The West Ham United full-back, 27, was forced to pull out from the team's warm-up ahead of their 3-0 victory in Dublin.
"He's going for a scan. We are not sure," manager Martin O'Neill is quoted as saying by Sky Sports News. "He just felt a little bit last night in the warm-up.
"So even though there was an opportunity last night to play him, we wouldn't have done so just because there might be some risk, so he is going for a scan later on.
"It's his hamstring. He just felt a little bit sore and it is just precautionary. But he wasn't too bad."
Ireland play another friendly on Tuesday when they face Poland in Poznan.
