| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 09-Jun-2012 | Simon Zebo | Ireland | 16-Mar-1990 | 22(86) |
| 09-Jun-2012 | Peter O'Mahony | Ireland | 17-Sep-1989 | 22(266) |
| 09-Jun-2012 | Conor Murray | Ireland | 20-Apr-1989 | 23(50) |
| 13-Aug-2011 | Cian Healy | Ireland | 07-Oct-1987 | 23(310) |
| 13-Aug-2011 | Keith Earls | Ireland | 02-Oct-1987 | 23(315) |
| 06-Aug-2011 | Luke Fitzgerald | Ireland | 13-Sep-1987 | 23(327) |
| 20-Aug-2011 | Felix Jones | Ireland | 15-Aug-1987 | 24(5) |
| 13-Aug-2011 | Sean O'Brien | Ireland | 14-Feb-1987 | 24(180) |
| 06-Aug-2011 | Fergus McFaddon | Ireland | 17-Jun-1986 | 25(50) |
| 06-Aug-2011 | Sean Cronin | Ireland | 06-May-1986 | 25(92) |
| 27-Aug-2011 | Stephen Ferris | Ireland | 02-Aug-1985 | 26(25) |
| 06-Aug-2011 | Jonathan Sexton | Ireland | 11-Jul-1985 | 26(26) |
| 06-Aug-2011 | Andrew Trimble | Ireland | 20-Oct-1984 | 26(290) |
| 09-Jun-2012 | Daniel Tuohy | Ireland | 18-Jun-1985 | 26(357) |
| 27-Aug-2011 | Tommy Bowe | Ireland | 22-Feb-1984 | 27(186) |
| 06-Aug-2011 | Donnacha Ryan | Ireland | 11-Dec-1983 | 27(238) |
| 20-Aug-2011 | James Heaslip | Ireland | 15-Dec-1983 | 27(248) |
| 16-Jun-2012 | Kevin McLaughlin | Ireland | 20-Sep-1984 | 27(269) |
| 06-Aug-2011 | Tomas O'Leary | Ireland | 22-Oct-1983 | 27(288) |
| 06-Aug-2011 | Robert Kearney | Ireland | 26-Mar-1983 | 28(133) |
| 09-Jun-2012 | Declan Fitzpatrick | Ireland | 12-Dec-1983 | 28(180) |
| 06-Aug-2011 | Niall Ronan | Ireland | 14-Sep-1982 | 28(326) |
| 13-Aug-2011 | Rory Best | Ireland | 15-Aug-1982 | 28(363) |
| 06-Aug-2011 | Denis Leamy | Ireland | 27-Nov-1981 | 29(252) |
| 06-Aug-2011 | Mike McCarthy | Ireland | 27-Nov-1981 | 29(252) |
| 20-Aug-2011 | Shane Jennings | Ireland | 08-Jul-1981 | 30(43) |
| 13-Aug-2011 | Eion Redden | Ireland | 20-Nov-1980 | 30(266) |
| 06-Aug-2011 | Tom Court | Ireland | 06-Nov-1980 | 30(273) |
| 06-Aug-2011 | Tony Buckley | Ireland | 08-Oct-1980 | 30(302) |
| 20-Aug-2011 | Gordon D'Arcy | Ireland | 10-Feb-1980 | 31(191) |
| 13-Aug-2011 | Mike Ross | Ireland | 21-Dec-1979 | 31(236) |
| 20-Aug-2011 | Paul O'Connell | Ireland | 20-Oct-1979 | 31(305) |
| 06-Aug-2011 | Paddy Wallace | Ireland | 27-Aug-1979 | 31(344) |
| 13-Aug-2011 | Donncha O'Callaghan | Ireland | 24-Mar-1979 | 32(142) |
| 20-Aug-2011 | Brian O'Driscoll | Ireland | 21-Jan-1979 | 32(211) |
| 27-Aug-2011 | Jerry Flannery | Ireland | 17-Oct-1978 | 32(314) |
| 27-Aug-2011 | Geordan Murphy | Ireland | 19-Apr-1978 | 33(130) |
| 06-Aug-2011 | Leo Cullen | Ireland | 09-Jan-1978 | 33(209) |
| 13-Aug-2011 | Ronan O'Gara | Ireland | 07-Mar-1977 | 34(159) |
| 27-Aug-2011 | David Wallace | Ireland | 08-Jul-1976 | 35(50) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).