| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 10-May-2013 |  Stuart Olding | Ulster | Ireland | 11-Mar-1993 | 20(60) |
| 10-May-2013 |  Samson Lee | Scarlets | Wales | 30-Nov-1992 | 20(161) |
| 10-May-2013 | Aled Davies | Scarlets | Wales | 19-Jul-1992 | 20(295) |
| 11-May-2013 |  Stuart Hogg | Glasgow Warriors | Scotland | 24-Jun-1992 | 20(321) |
| 10-May-2013 | George North | Scarlets | Wales | 13-Apr-1992 | 21(27) |
| 10-May-2013 | Owen Williams | Scarlets | Wales | 27-Feb-1992 | 21(73) |
| 10-May-2013 | Paddy Jackson | Ulster | Ireland | 05-Jan-1992 | 21(126) |
| 10-May-2013 | Liam Williams | Scarlets | Wales | 09-Apr-1991 | 22(32) |
| 10-May-2013 | Scott Williams | Scarlets | Wales | 10-Oct-1990 | 22(213) |
| 11-May-2013 | Alex Dunbar | Glasgow Warriors | Scotland | 23-Apr-1990 | 23(18) |
| 11-May-2013 | Peter Horne | Glasgow Warriors | Scotland | 05-Oct-1989 | 23(218) |
| 11-May-2013 | Ryan Wilson | Glasgow Warriors | Scotland | 18-May-1989 | 23(358) |
| 11-May-2013 | Nikola Matawalu | Glasgow Warriors | Fiji | 08-Mar-1989 | 24(64) |
| 25-May-2013 |  Ian Madigan | Leinster | Ireland | 21-Mar-1989 | 24(65) |
| 11-May-2013 | Sean Maitland | Glasgow Warriors | Scotland | 14-Sep-1988 | 24(239) |
| 10-May-2013 | Jon Davies | Scarlets | Wales | 05-Apr-1988 | 25(35) |
| 11-May-2013 | Cian Healy | Leinster | Ireland | 07-Oct-1987 | 25(217) |
| 10-May-2013 | Aaron Shingler | Scarlets | Wales | 07-Aug-1987 | 25(277) |
| 11-May-2013 | Pat McArthur | Glasgow Warriors | Scotland | 27-Apr-1987 | 26(15) |
| 10-May-2013 | Darren Cave | Ulster | Ireland | 05-Apr-1987 | 26(36) |
| 11-May-2013 | Sean O'Brien | Leinster | Ireland | 14-Feb-1987 | 26(87) |
| 11-May-2013 | Tim Swinson | Glasgow Warriors | Scotland | 11-Feb-1987 | 26(90) |
| 10-May-2013 | George Earle | Scarlets | South Africa | 09-Jan-1987 | 26(122) |
| 10-May-2013 | Ken Owens | Scarlets | Wales | 03-Jan-1987 | 26(128) |
| 11-May-2013 | Joshua Strauss | Glasgow Warriors | Scotland | 23-Oct-1986 | 26(201) |
| 11-May-2013 | Jon Welsh | Glasgow Warriors | Scotland | 13-Oct-1986 | 26(211) |
| 11-May-2013 | John Barclay | Glasgow Warriors | Scotland | 24-Sep-1986 | 26(230) |
| 11-May-2013 | Devin Toner | Leinster | Ireland | 29-Jun-1986 | 26(317) |
| 11-May-2013 | Fergus McFaddon | Leinster | Ireland | 17-Jun-1986 | 26(329) |
| 11-May-2013 | Daniel Van Der Merwe | Glasgow Warriors | Canada | 28-Apr-1986 | 27(13) |
| 11-May-2013 | Richard Strauss | Leinster | Ireland | 29-Jan-1986 | 27(102) |
| 10-May-2013 | Robert Diack | Ulster | Ireland | 12-Nov-1985 | 27(179) |
| 10-May-2013 | Andrew Fenby | Scarlets | England | 24-Oct-1985 | 27(198) |
| 10-May-2013 | Jared Payne | Ulster | Ireland | 13-Oct-1985 | 27(209) |
| 10-May-2013 | Robert McCusker | Scarlets | Wales | 12-Oct-1985 | 27(210) |
| 11-May-2013 | Ryan Grant | Glasgow Warriors | Scotland | 08-Oct-1985 | 27(215) |
| 11-May-2013 | Jonathan Sexton | Leinster | Ireland | 11-Jul-1985 | 27(304) |
| 10-May-2013 | Daniel Tuohy | Ulster | Ireland | 18-Jun-1985 | 27(326) |
| 10-May-2013 | Andrew Trimble | Ulster | Ireland | 20-Oct-1984 | 28(202) |
| 10-May-2013 | Chris Henry | Ulster | Ireland | 17-Oct-1984 | 28(205) |
| 11-May-2013 | Kevin McLaughlin | Leinster | Ireland | 20-Sep-1984 | 28(233) |
| 10-May-2013 | Johan Snyman | Scarlets | South Africa | 09-Jul-1984 | 28(305) |
| 10-May-2013 | Josh Turnbull | Scarlets | Wales | 12-Mar-1984 | 29(59) |
| 10-May-2013 | Rhian Pienaar | Ulster | South Africa | 10-Mar-1984 | 29(61) |
| 10-May-2013 | Tommy Bowe | Ulster | Ireland | 22-Feb-1984 | 29(78) |
| 11-May-2013 | James Heaslip | Leinster | Ireland | 15-Dec-1983 | 29(148) |
| 10-May-2013 | Declan Fitzpatrick | Ulster | Ireland | 12-Dec-1983 | 29(150) |
| 10-May-2013 | Nick Williams | Ulster | New Zealand | 02-Dec-1983 | 29(160) |
| 25-May-2013 | John Afoa | Ulster | New Zealand | 16-Oct-1983 | 29(222) |
| 11-May-2013 | Robert Kearney | Leinster | Ireland | 26-Mar-1983 | 30(47) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).