| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 26-Feb-2012 |  Stuart Hogg | Scotland | Scotland | 24-Jun-1992 | 19(246) |
| 05-Feb-2012 |  George North | Wales | Wales | 13-Apr-1992 | 19(297) |
| 04-Feb-2012 |  Owen Farrell | England | England | 21-Sep-1991 | 20(136) |
| 25-Feb-2012 | Manu Tuilagi | England | England | 18-May-1991 | 20(283) |
| 04-Feb-2012 |  Tommaso Benvenuti | Italy | Italy | 12-Dec-1990 | 21(54) |
| 05-Feb-2012 | Toby Faletau | Wales | Wales | 12-Nov-1990 | 21(85) |
| 05-Feb-2012 | Alex Cuthbert | Wales | Wales | 05-Apr-1990 | 21(306) |
| 04-Feb-2012 | Giovanbattista Venditti | Italy | Italy | 27-Mar-1990 | 21(314) |
| 04-Feb-2012 | Eduardo Gori | Italy | Italy | 05-Mar-1990 | 21(336) |
| 04-Feb-2012 | David Denton | Scotland | Scotland | 05-Feb-1990 | 21(364) |
| 04-Feb-2012 | Ben Youngs | England | England | 05-Sep-1989 | 22(152) |
| 04-Feb-2012 | Richie Gray | Scotland | Scotland | 24-Aug-1989 | 22(164) |
| 10-Mar-2012 |  Peter O'Mahony | Ireland | Ireland | 17-Sep-1989 | 22(175) |
| 11-Mar-2012 | Charles Sharples | England | England | 17-Aug-1989 | 22(207) |
| 10-Mar-2012 | Justin Tipuric | Wales | Wales | 06-Aug-1989 | 22(217) |
| 05-Feb-2012 | Conor Murray | Ireland | Ireland | 20-Apr-1989 | 22(291) |
| 25-Feb-2012 | Ben Morgan | England | England | 18-Feb-1989 | 23(6) |
| 05-Feb-2012 | Leigh Halfpenny | Wales | Wales | 22-Dec-1988 | 23(44) |
| 26-Feb-2012 |  Morgan Parra | France | France | 15-Nov-1988 | 23(102) |
| 05-Feb-2012 | Sam Warburton | Wales | Wales | 05-Oct-1988 | 23(122) |
| 10-Mar-2012 | Simone Favaro | Italy | Italy | 07-Nov-1988 | 23(123) |
| 04-Feb-2012 | Alex Corbisiero | England | England | 30-Aug-1988 | 23(157) |
| 04-Feb-2012 | Lee Jones | Scotland | Scotland | 28-Jun-1988 | 23(220) |
| 05-Feb-2012 | Jon Davies | Wales | Wales | 05-Apr-1988 | 23(305) |
| 04-Feb-2012 | Wesley Fofana | France | France | 20-Jan-1988 | 24(15) |
| 26-Feb-2012 | Yohan Maestri | France | France | 14-Jan-1988 | 24(43) |
| 12-Feb-2012 | Dan Lydiatt | Wales | Wales | 18-Dec-1987 | 24(56) |
| 05-Feb-2012 | Cian Healy | Ireland | Ireland | 07-Oct-1987 | 24(121) |
| 25-Feb-2012 | Keith Earls | Ireland | Ireland | 02-Oct-1987 | 24(146) |
| 17-Mar-2012 | Alexis Palisson | France | France | 09-Sep-1987 | 24(190) |
| 04-Feb-2012 | Luke McLean | Italy | Italy | 11-May-1987 | 24(269) |
| 04-Feb-2012 | Dan Cole | England | England | 09-May-1987 | 24(271) |
| 04-Feb-2012 | Chris Ashton | England | England | 29-Mar-1987 | 24(312) |
| 05-Feb-2012 | Sean O'Brien | Ireland | Ireland | 14-Feb-1987 | 24(356) |
| 05-Feb-2012 | Rhys Priestland | Wales | Wales | 07-Jan-1987 | 25(29) |
| 25-Feb-2012 | Ken Owens | Wales | Wales | 03-Jan-1987 | 25(53) |
| 04-Feb-2012 | Alberto Sgarbi | Italy | Italy | 26-Nov-1986 | 25(70) |
| 04-Feb-2012 | Maxime Medard | France | France | 16-Nov-1986 | 25(80) |
| 04-Feb-2012 | Francois Trinh Duc | France | France | 11-Nov-1986 | 25(85) |
| 05-Feb-2012 | Jamie Roberts | Wales | Wales | 08-Nov-1986 | 25(89) |
| 05-Feb-2012 | Rhys Gill | Wales | Wales | 30-Oct-1986 | 25(98) |
| 26-Feb-2012 | John Barclay | Scotland | Scotland | 24-Sep-1986 | 25(155) |
| 17-Mar-2012 | Jon Welsh | Scotland | Scotland | 13-Oct-1986 | 25(156) |
| 04-Feb-2012 | Bradley Barritt | England | England | 07-Aug-1986 | 25(181) |
| 05-Feb-2012 | Fergus McFaddon | Ireland | Ireland | 17-Jun-1986 | 25(233) |
| 04-Feb-2012 | Chris Robshaw | England | England | 04-Jun-1986 | 25(245) |
| 10-Mar-2012 | Fabio Semenzato | Italy | Italy | 06-May-1986 | 25(309) |
| 04-Feb-2012 | Ross Rennie | Scotland | Scotland | 29-Mar-1986 | 25(312) |
| 04-Feb-2012 | Dylan Hartley | England | England | 24-Mar-1986 | 25(317) |
| 04-Feb-2012 | Louis Picamoles | France | France | 05-Feb-1986 | 25(364) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).