| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 21-Nov-2014 |  Zander Fagerson | Glasgow Warriors | Scotland | 19-Jan-1996 | 18(307) |
| 06-Sep-2014 | Tyler Morgan | Gwent Dragons | Wales | 11-Sep-1995 | 18(361) |
| 20-Sep-2014 | Marco Lazzaroni | Benetton Treviso | Italy | 18-Aug-1995 | 19(33) |
| 16-May-2015 |  Sam Arnold | Ulster | Ireland | 08-Apr-1996 | 19(37) |
| 31-Oct-2014 |  Magnus Bradbury | Edinburgh Rugby | Scotland | 23-Aug-1995 | 19(69) |
| 06-Sep-2014 | Jack Dixon | Gwent Dragons | Wales | 13-Dec-1994 | 19(267) |
| 25-Apr-2015 |  Garyn Smith | Cardiff Blues | Wales | 12-Jul-1995 | 19(287) |
| 13-Feb-2015 | Rory Thornton | Ospreys | Wales | 16-Mar-1995 | 19(334) |
| 21-Feb-2015 | Dafydd Howells | Ospreys | Wales | 22-Mar-1995 | 19(336) |
| 01-Nov-2014 | Ashton Hewitt | Gwent Dragons | Wales | 20-Nov-1994 | 19(346) |
| 12-Sep-2014 | Hallam Amos | Gwent Dragons | Wales | 24-Sep-1994 | 19(353) |
| 09-Jan-2015 |  Ryan Elias | Scarlets | Wales | 07-Jan-1995 | 20(2) |
| 20-Sep-2014 | Angus O'Brien | Gwent Dragons | Wales | 17-Sep-1994 | 20(3) |
| 03-Jan-2015 | D'Arcy Rae | Benetton Treviso | Scotland | 21-Dec-1994 | 20(13) |
| 01-Nov-2014 | Steffan Evans | Scarlets | Wales | 01-Sep-1994 | 20(61) |
| 05-Sep-2014 | Nicky Smith | Ospreys | Wales | 07-Apr-1994 | 20(151) |
| 06-Sep-2014 | Jonny Gray | Glasgow Warriors | Scotland | 14-Mar-1994 | 20(176) |
| 06-Sep-2014 | Elliott Dee | Gwent Dragons | Wales | 07-Mar-1994 | 20(183) |
| 16-May-2015 | Aled Summerhill | Cardiff Blues | Wales | 02-Nov-1994 | 20(195) |
| 13-Feb-2015 | Scott Otten | Ospreys | Wales | 19-Jul-1994 | 20(209) |
| 10-Oct-2014 | Shane Delahunt | Connacht | Ireland | 02-Feb-1994 | 20(250) |
| 01-Nov-2014 | James Benjamin | Gwent Dragons | Wales | 21-Feb-1994 | 20(253) |
| 01-Nov-2014 |  Rory Scannell | Munster | Ireland | 22-Dec-1993 | 20(314) |
| 13-Sep-2014 | Jordan Williams | Scarlets | Wales | 20-Sep-1993 | 20(358) |
| 08-May-2015 | Luc Jones | Gwent Dragons | Wales | 12-May-1994 | 20(361) |
| 31-Oct-2014 | Sam Davies | Ospreys | Wales | 06-Oct-1993 | 21(25) |
| 13-Feb-2015 | Damien Hoyland | Edinburgh Rugby | Scotland | 11-Jan-1994 | 21(33) |
| 14-Feb-2015 | Jack O'Donoghue | Munster | Ireland | 08-Jan-1994 | 21(37) |
| 26-Dec-2014 | Ultan Dilane | Connacht | Ireland | 09-Nov-1993 | 21(47) |
| 21-Sep-2014 | Sam Hidalgo-Clyne | Edinburgh Rugby | Scotland | 04-Aug-1993 | 21(48) |
| 07-Sep-2014 | Owen Jenkins | Cardiff Blues | Wales | 20-Jul-1993 | 21(49) |
| 26-Sep-2014 | Adam Ashe | Glasgow Warriors | Scotland | 24-Jul-1993 | 21(64) |
| 29-Nov-2014 |  Bryan Byrne | Leinster | Ireland | 09-Sep-1993 | 21(81) |
| 12-Sep-2014 | Robbie Henshaw | Connacht | Ireland | 12-Jun-1993 | 21(92) |
| 20-Sep-2014 | Angelo Esposito | Benetton Treviso | Italy | 14-Jun-1993 | 21(98) |
| 31-Oct-2014 | Ieuan Jones | Ospreys | Wales | 22-Jul-1993 | 21(101) |
| 06-Sep-2014 | Darragh Leader | Connacht | Ireland | 22-May-1993 | 21(107) |
| 07-Sep-2014 | Rhys Patchell | Cardiff Blues | Wales | 17-May-1993 | 21(113) |
| 19-Sep-2014 | Edoardo Padovani | Zebre | Italy | 15-May-1993 | 21(127) |
| 13-Sep-2014 | Rhodri Williams | Scarlets | Wales | 05-May-1993 | 21(131) |
| 06-Sep-2014 | Harry Robinson | Scarlets | Wales | 16-Apr-1993 | 21(143) |
| 11-Oct-2014 | Josh van der Flier | Leinster | Ireland | 25-Apr-1993 | 21(169) |
| 28-Sep-2014 | Matteo Zanusso | Benetton Treviso | Italy | 09-Apr-1993 | 21(172) |
| 05-Sep-2014 | Michele Campagnaro | Benetton Treviso | Italy | 13-Mar-1993 | 21(176) |
| 06-Sep-2014 | Stuart Olding | Ulster | Ireland | 11-Mar-1993 | 21(179) |
| 21-Nov-2014 | Ali Price | Glasgow Warriors | Scotland | 12-May-1993 | 21(193) |
| 12-Sep-2014 | David Odiete | Zebre | Italy | 24-Feb-1993 | 21(200) |
| 23-Nov-2014 | Ellis Jenkins | Cardiff Blues | Wales | 29-Apr-1993 | 21(208) |
| 07-Sep-2014 | Cory Allen | Cardiff Blues | Wales | 11-Feb-1993 | 21(208) |
| 06-Sep-2014 | Mark Bennett | Glasgow Warriors | Scotland | 03-Feb-1993 | 21(215) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).