| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 09-Dec-2023 |  Lucas De La Rua | Cardiff Blues | Wales | 13-Sep-2004 | 19(86) |
| 09-Dec-2023 |  Marvin Okuya | Lyon OU | France | 29-Dec-2003 | 19(345) |
| 09-Dec-2023 | Mackenzie Martin | Cardiff Blues | Wales | 26-Oct-2003 | 20(44) |
| 09-Dec-2023 |  Gregory Fisilau | Exeter Chiefs | England | 09-Jul-2003 | 20(153) |
| 08-Dec-2023 | Nicolas Depoortere | Begles-Bordeaux | France | 13-Jan-2003 | 20(329) |
| 09-Dec-2023 | Immanuel Feyi Waboso | Exeter Chiefs | England | 20-Dec-2002 | 20(354) |
| 09-Dec-2023 | Efan Daniel | Cardiff Blues | Wales | 14-Dec-2002 | 20(360) |
| 09-Dec-2023 | Dafydd Jenkins | Exeter Chiefs | Wales | 05-Dec-2002 | 21(4) |
| 09-Dec-2023 | Canan Moodie | Bulls | South Africa | 05-Nov-2002 | 21(34) |
| 08-Dec-2023 |  George Hendy | Northampton Saints | England | 15-Oct-2002 | 21(54) |
| 08-Dec-2023 | Tevita Tatafu | Begles-Bordeaux | France | 13-Oct-2002 | 21(56) |
| 08-Dec-2023 | Tom Lockett | Northampton Saints | England | 06-Oct-2002 | 21(63) |
| 09-Dec-2023 | Matis Perchaud | Bayonne | France | 17-Sep-2002 | 21(83) |
| 09-Dec-2023 | Reinhardt Ludwig | Bulls | South Africa | 27-Aug-2002 | 21(104) |
| 09-Dec-2023 | Joe Hawkins | Exeter Chiefs | Wales | 11-Jun-2002 | 21(181) |
| 08-Dec-2023 | Fin Smith | Northampton Saints | England | 11-May-2002 | 21(211) |
| 05-Apr-2024 | Max Williamson | Glasgow Warriors | Scotland | 05-Aug-2002 | 21(244) |
| 09-Dec-2023 | Mason Grady | Cardiff Blues | Wales | 29-Mar-2002 | 21(255) |
| 09-Dec-2023 |  Nathan Doak | Ulster | Ireland | 17-Dec-2001 | 21(357) |
| 08-Dec-2023 | Cathal Forde | Connacht | Ireland | 04-Nov-2001 | 22(34) |
| 05-Apr-2024 |  Fin Baxter | Harlequins | England | 12-Feb-2002 | 22(53) |
| 09-Dec-2023 | Yanis Charcosset | Lyon OU | France | 28-Aug-2001 | 22(103) |
| 09-Dec-2023 | Matthias Halagahu | Toulon | France | 15-Aug-2001 | 22(116) |
| 08-Dec-2023 | Darragh Murray | Connacht | Ireland | 04-Jul-2001 | 22(157) |
| 08-Dec-2023 | Pierre Bochaton | Begles-Bordeaux | France | 17-Apr-2001 | 22(235) |
| 09-Dec-2023 | Jacob Beetham | Cardiff Blues | Wales | 18-Apr-2001 | 22(235) |
| 08-Dec-2023 | Thomas Freeman | Northampton Saints | England | 05-Mar-2001 | 22(278) |
| 09-Dec-2023 | Alfred Parisien | Lyon OU | France | 04-Mar-2001 | 22(280) |
| 09-Dec-2023 |  Edgar Retiere | Toulouse | France | 29-Jan-2001 | 22(314) |
| 09-Dec-2023 | Tom Stewart | Ulster | Ireland | 11-Jan-2001 | 22(332) |
| 09-Dec-2023 | Ethan Dumortier | Lyon OU | France | 29-Dec-2000 | 22(345) |
| 09-Dec-2023 | Mickael Guillard | Lyon OU | France | 10-Dec-2000 | 22(364) |
| 09-Dec-2023 |  Juan Martin Gonzalez Samso | Saracens | Argentina | 14-Nov-2000 | 23(24) |
| 09-Dec-2023 | Gael Drean | Toulon | France | 22-Oct-2000 | 23(47) |
| 09-Dec-2023 | Teddy Williams | Cardiff Blues | Wales | 18-Oct-2000 | 23(51) |
| 09-Dec-2023 | Alfie Barbeary | Bath | England | 05-Oct-2000 | 23(64) |
| 08-Dec-2023 | Oli Smith | Glasgow Warriors | Scotland | 07-Aug-2000 | 23(122) |
| 05-Apr-2024 | Louis Lynagh | Harlequins | Italy | 03-Dec-2000 | 23(123) |
| 08-Dec-2023 | Andrew Smith | Connacht | Ireland | 21-Jul-2000 | 23(139) |
| 09-Dec-2023 |  Scott Buckley | Munster | Ireland | 13-Jun-2000 | 23(178) |
| 09-Dec-2023 | Rusi Tuima | Exeter Chiefs | England | 21-May-2000 | 23(201) |
| 09-Dec-2023 | Thomas Dolhagaray | Bayonne | France | 21-May-2000 | 23(201) |
| 08-Dec-2023 | Byron Ralston | Connacht | Australia | 03-May-2000 | 23(218) |
| 08-Dec-2023 | Shamus Hurley-Langton | Connacht | New Zealand | 22-Apr-2000 | 23(229) |
| 09-Dec-2023 | Pierre Pacheco | Lyon OU | France | 16-Apr-2000 | 23(236) |
| 08-Dec-2023 | Ollie Sleightholme | Northampton Saints | England | 13-Apr-2000 | 23(238) |
| 05-Apr-2024 | George Hammond | Harlequins | England | 31-Jul-2000 | 23(248) |
| 09-Dec-2023 | Hugh Tizard | Saracens | England | 31-Mar-2000 | 23(252) |
| 08-Dec-2023 | Cian Prendergast | Connacht | Ireland | 23-Feb-2000 | 23(288) |
| 08-Dec-2023 | Rory Darge | Glasgow Warriors | Scotland | 23-Feb-2000 | 23(288) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).