| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 14-Oct-2012 |  Gael Fickou | Toulouse | France | 26-Mar-1994 | 18(203) |
| 20-Oct-2012 | Christopher Tolofua | Toulouse | France | 31-Dec-1993 | 18(294) |
| 13-Oct-2012 |  Robbie Henshaw | Connacht | Ireland | 12-Jun-1993 | 19(123) |
| 19-Jan-2013 | Mathieu Babillot | Castres | France | 09-Sep-1993 | 19(132) |
| 14-Oct-2012 |  Nathan Fowles | Sale Sharks | England | 08-Apr-1993 | 19(189) |
| 09-Dec-2012 |  Rhys Patchell | Cardiff Blues | Wales | 17-May-1993 | 19(206) |
| 14-Oct-2012 | Mark Jennings | Sale Sharks | England | 27-Feb-1993 | 19(229) |
| 09-Dec-2012 | Harry Robinson | Cardiff Blues | Wales | 16-Apr-1993 | 19(237) |
| 15-Dec-2012 |  Jack Nowell | Exeter Chiefs | England | 11-Apr-1993 | 19(248) |
| 09-Dec-2012 |  George Ford | Leicester Tigers | England | 16-Mar-1993 | 19(268) |
| 12-Jan-2013 | Matt Robinson | Cardiff Blues | Wales | 16-Apr-1993 | 19(271) |
| 13-Oct-2012 |  Samson Lee | Scarlets | Wales | 30-Nov-1992 | 19(317) |
| 15-Dec-2012 | Lewis Jones | Cardiff Blues | Wales | 24-Nov-1992 | 20(21) |
| 14-Oct-2012 | Vincent Martin | Toulon | France | 04-Sep-1992 | 20(40) |
| 14-Oct-2012 | Will Addison | Sale Sharks | England | 20-Aug-1992 | 20(55) |
| 08-Dec-2012 | Ross Harrison | Sale Sharks | England | 03-Sep-1992 | 20(96) |
| 07-Dec-2012 |  Jamie Elliott | Northampton Saints | England | 31-Aug-1992 | 20(98) |
| 14-Oct-2012 | Stuart Hogg | Glasgow Warriors | Scotland | 24-Jun-1992 | 20(112) |
| 14-Oct-2012 | Yohan Artru | Montpellier | France | 31-May-1992 | 20(136) |
| 08-Dec-2012 | Aled Davies | Scarlets | Wales | 19-Jul-1992 | 20(142) |
| 13-Oct-2012 | George North | Scarlets | Wales | 13-Apr-1992 | 20(183) |
| 14-Oct-2012 | Ilian Perraux | Montpellier | France | 04-Apr-1992 | 20(193) |
| 12-Oct-2012 | Eli Walker | Ospreys | Wales | 28-Mar-1992 | 20(198) |
| 08-Dec-2012 | Virimi Vakatawa | Racing CF | France | 01-May-1992 | 20(221) |
| 20-Jan-2013 | Giovanni Maistri | Benetton Treviso | Italy | 04-Jun-1992 | 20(230) |
| 12-Oct-2012 |  Iain Henderson | Ulster | Ireland | 21-Feb-1992 | 20(234) |
| 13-Jan-2013 | Tom Habberfield | Ospreys | Wales | 19-May-1992 | 20(239) |
| 13-Oct-2012 | Kieran Marmion | Connacht | Ireland | 11-Feb-1992 | 20(245) |
| 15-Dec-2012 | Kelian Galletier | Montpellier | France | 18-Mar-1992 | 20(272) |
| 12-Oct-2012 | Paddy Jackson | Ulster | Ireland | 05-Jan-1992 | 20(281) |
| 11-Jan-2013 | Joshua Beaumont | Sale Sharks | England | 24-Mar-1992 | 20(293) |
| 13-Jan-2013 |  Robin Hislop | Edinburgh Rugby | Scotland | 26-Feb-1992 | 20(322) |
| 08-Dec-2012 | Leonardo Sarto | Zebre | Italy | 15-Jan-1992 | 20(328) |
| 08-Dec-2012 | Ross Jones | Ospreys | Wales | 11-Jan-1992 | 20(332) |
| 14-Oct-2012 | Thomas Taylor | Sale Sharks | England | 11-Nov-1991 | 20(338) |
| 15-Dec-2012 | Macauley Cook | Cardiff Blues | Wales | 31-Dec-1991 | 20(350) |
| 21-Oct-2012 | Greg Hunter | Edinburgh Rugby | Scotland | 26-Sep-1991 | 21(26) |
| 12-Jan-2013 |  Jean-Marcel Buttin | Clermont Auvergne | France | 16-Dec-1991 | 21(28) |
| 20-Oct-2012 |  Owen Farrell | Saracens | England | 21-Sep-1991 | 21(30) |
| 15-Dec-2012 | Michael Haywood | Northampton Saints | England | 10-Nov-1991 | 21(36) |
| 13-Oct-2012 |  Andrew Conway | Leinster | Ireland | 11-Jul-1991 | 21(95) |
| 12-Jan-2013 | Owen Williams | Cardiff Blues | Wales | 02-Oct-1991 | 21(103) |
| 15-Dec-2012 | Gillian Galan | Toulouse | France | 07-Aug-1991 | 21(131) |
| 14-Oct-2012 | Pierre Berard | Montpellier | France | 23-May-1991 | 21(145) |
| 15-Dec-2012 |  Charles Matthews | Harlequins | England | 23-Jul-1991 | 21(146) |
| 14-Oct-2012 | Manu Tuilagi | Leicester Tigers | England | 18-May-1991 | 21(150) |
| 13-Oct-2012 | Rob Buchanan | Harlequins | England | 13-May-1991 | 21(154) |
| 07-Dec-2012 | Eoin McKeown | Connacht | Ireland | 23-Jun-1991 | 21(168) |
| 11-Jan-2013 | James Doyle | Sale Sharks | England | 19-Jul-1991 | 21(177) |
| 20-Oct-2012 |  Jean Pascal Barraque | Biarritz | France | 24-Apr-1991 | 21(180) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).