Norwich midfielder Anthony Pilkington is a doubt for the Republic of Ireland's friendly against Latvia on Friday night.
The Ireland squad met up in Portmarnock on Monday as they prepared to begin training under new management duo Martin O'Neill and Roy Keane.
However, Pilkington was not among them as he remained in Norfolk for treatment on a dead leg.
A spokesman for the Football Association of Ireland said: "Anthony Pilkington has emerged as an injury doubt after coming off during Norwich's clash against West Ham on Saturday with a dead leg.
"He will remain with his club until Thursday while his progress is monitored."
O'Neill and Keane are due to get to work in earnest on Tuesday morning ahead of the first game of their reign against the Latvians at the Aviva Stadium.
They will then head for Poznan for a second friendly against Poland next Tuesday evening.
Robbie Brady (groin) and Ciaran Clark (foot tendon) have already been ruled out of the upcoming international double header.
No replacements have been called up yet but should Pilkington be unable to travel, O'Neill's hand may be forced.