Fahey, 29, has been struggling with the injury since joining up with the national squad and took no part in Saturday's 1-0 friendly victory over Bosnia & Herzegovina.

Paul Green, who is without a club after leaving Derby County at the end of last season, has been called up as a replacement.

"During the warm-ups at today's match, Keith Fahey felt something (was) not quite right. He was scanned following the match," an FAI representative said.

"The FAI medical team have just received the results of the scan which showed unfortunately that his groin strain was persisting. The results were discussed with the player and he agreed that he would not recover fully in time for Euro 2012.

"As a result, he is departing from the squad and Paul Green is being called in. Giovanni Trapattoni spoke to the player (Fahey), who is very disappointed to miss out on Euro 2012, and told him that he remains part of his plans for the future."

Ireland play another friendly against Hungary in Budapest on Monday, before beginning their European Championship campaign with a match against Group C opponents Croatia on June 10.