He picked up the injury against England on Saturday
Republic of Ireland assistant manager John O'Shea admits they must improve on the display shown against England last Saturday.
The Boys in Green were beaten 2-0 in their Nations League opener at the Aviva Stadium.
Next up is a meeting with Greece tomorrow night.
Seamus Coleman will miss the game due to an injury sustained on Saturday.
Festy Ebosele has been drafted in as Coleman's replacement, with the Irish squad due to train again today.
Kick off tomorrow is at 7.45.
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