Skipper Stephen Kelly of Tottenham Hotspur is the most notable withdrawal, with Newcastle's Stephen Brennan and Stephen Paisley of Longford Town also crying off.
Leeds' Henry McStay is called in as replacement right back after impressive displays at U19 and U21 in the Madeira International tournament.
Joe Kendrick of Darlington, whose 2003 season was curtailed by injury, is called up, along with Wolves' Gary Mulligan.
Kendrick was previously on the books of German side 1860 Munich, and is already capped at U16, U18 and U20 level.
Squad in full: Henderson (Aston Villa), Murphy (Swansea City), McStay (Leeds United), McCarthy (Manchester City), Fitzgerald (Blackburn Rovers), Capper (Scarborough), Foley (Luton Town), Flood (Manchester City), Potter (Liverpool), Whelan (Sheffield Wednesday), Thornton (Sunderland), Kearney (Cork City), Doyle (Cork City), Elliott (Sunderland), Tabb (Brentford), McGeady (Celtic), Kendrick (Darlington), Mulligan (Wolverhampton Wanderers).