Striker Troy Parrott will miss the Republic of Ireland’s Nations League double-header against Bulgaria and Finland having picked up an injury during a pre-season game for Millwall.
The Spurs loanee has been replaced in the Stephen Kenny’s squad by Preston North End forward Sean Maguire.
Midfielder James McCarthy is also an injury doubt to feature in Kenny’s first games since taking charge and will be assessed following an injury sustained while on pre-season duty for Crystal Palace.
The Republic face Bulgaria away in Kenny’s maiden fixture on Thursday before hosting Finland on Sunday.
Uncapped West Brom defender Dara O’Shea has been added to the squad.
“Dara has come through the ranks, from under-15 right through,” said Kenny.
“He showed himself capable of playing in all four positions with West Brom last year, he is a centre-half really but has played right-back, left-back.
“With one or two additional injuries, strains and so forth, we’ve given ourselves that additional cover with Dara coming in.
“His ability to play the four positions is an asset.”
Teenage striker Parrott, who made his international debut in November’s friendly win over New Zealand, pulled up during Millwall’s 3-0 win over Southend United on Saturday after having scored his second goal in as many pre-season games following his loan switch from Tottenham Hotspur.
Parrott travelled with the side was but ruled out on Sunday evening after further assessment.
McCarthy must also be assessed after sustaining a knock in Palace’s friendly win over Oxford United on Tuesday.
The 30-year-old midfielder’s last international cap came in October 2016.