| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 10-Dec-2016 |  Tom Curry | Sale Sharks | England | 15-Jun-1998 | 18(179) |
| 15-Oct-2016 | Paolo Odogwu | Sale Sharks | Italy | 18-Feb-1997 | 19(239) |
| 11-Dec-2016 |  Jack Maunder | Exeter Chiefs | England | 05-Apr-1997 | 19(250) |
| 17-Dec-2016 |  Geoffrey Cros | Begles-Bordeaux | France | 08-Mar-1997 | 19(284) |
| 15-Oct-2016 | Antoine Dupont | Castres | France | 15-Nov-1996 | 19(334) |
| 14-Jan-2017 |  William Evans | Leicester Tigers | England | 28-Jan-1997 | 19(351) |
| 10-Dec-2016 | George Worth | Leicester Tigers | England | 08-Oct-1996 | 20(63) |
| 22-Oct-2016 | Anthony Jelonch | Castres | France | 28-Jul-1996 | 20(86) |
| 15-Oct-2016 |  Harry Mallinder | Northampton Saints | England | 13-Jun-1996 | 20(124) |
| 07-Jan-2017 | Matthieu Voisin | Racing CF | France | 16-May-1996 | 20(236) |
| 22-Oct-2016 | Rory Hutchinson | Northampton Saints | Scotland | 29-Jan-1996 | 20(267) |
| 14-Oct-2016 | Zander Fagerson | Glasgow Warriors | Scotland | 19-Jan-1996 | 20(269) |
| 23-Oct-2016 | Camille Chat | Racing CF | France | 18-Dec-1995 | 20(310) |
| 15-Oct-2016 |  Joey Carbery | Leinster | Ireland | 01-Nov-1995 | 20(349) |
| 21-Jan-2017 | George Nott | Sale Sharks | England | 21-Jan-1996 | 21(1) |
| 15-Jan-2017 |  Daniel Jones | Scarlets | Wales | 07-Jan-1996 | 21(9) |
| 15-Jan-2017 | Ed Holmes | Exeter Chiefs | England | 27-Dec-1995 | 21(20) |
| 15-Jan-2017 |  Kieran Treadwell | Ulster | England | 16-Nov-1995 | 21(61) |
| 23-Oct-2016 | Peter Robb | Connacht | Ireland | 19-Jul-1995 | 21(97) |
| 10-Dec-2016 |  Arthur Bonneval | Toulouse | France | 31-May-1995 | 21(194) |
| 10-Dec-2016 | Julian Marchand | Toulouse | France | 10-May-1995 | 21(215) |
| 14-Oct-2016 | Ellis Genge | Leicester Tigers | England | 16-Feb-1995 | 21(241) |
| 16-Oct-2016 | Cyril Cazeaux | Begles-Bordeaux | France | 10-Feb-1995 | 21(249) |
| 22-Oct-2016 |  Nick Tompkins | Saracens | Wales | 16-Feb-1995 | 21(249) |
| 17-Dec-2016 | Ross Byrne | Leinster | Ireland | 08-Apr-1995 | 21(254) |
| 15-Oct-2016 | Gary Ringrose | Leinster | Ireland | 26-Jan-1995 | 21(263) |
| 09-Dec-2016 | Paul Hill | Northampton Saints | England | 02-Mar-1995 | 21(283) |
| 10-Dec-2016 | James Mitchell | Sale Sharks | England | 11-Feb-1995 | 21(303) |
| 22-Oct-2016 | Will Boyde | Scarlets | Wales | 15-Dec-1994 | 21(312) |
| 23-Oct-2016 | Sean O'Brien | Connacht | Ireland | 09-Dec-1994 | 21(319) |
| 15-Oct-2016 | Maro Itoje | Saracens | England | 28-Oct-1994 | 21(353) |
| 21-Jan-2017 | Ryan Elias | Scarlets | Wales | 07-Jan-1995 | 22(15) |
| 10-Dec-2016 | Gideon Koegelenberg | Zebre | South Africa | 25-Nov-1994 | 22(16) |
| 15-Oct-2016 | Cameron Neild | Sale Sharks | England | 06-Sep-1994 | 22(40) |
| 15-Oct-2016 | Steffan Evans | Scarlets | Wales | 01-Sep-1994 | 22(45) |
| 15-Oct-2016 | Cian Kelleher | Connacht | Ireland | 07-Aug-1994 | 22(70) |
| 15-Jan-2017 | Ross Kane | Ulster | Ireland | 14-Oct-1994 | 22(94) |
| 14-Jan-2017 | So'otala Fa'aso'a | Racing CF | Tonga | 02-Oct-1994 | 22(105) |
| 15-Oct-2016 | Sam James | Sale Sharks | England | 03-Jul-1994 | 22(105) |
| 15-Oct-2016 | Michael Haley | Sale Sharks | Ireland | 28-Jun-1994 | 22(110) |
| 15-Jan-2017 | Nathan Earle | Saracens | England | 25-Sep-1994 | 22(113) |
| 17-Dec-2016 | Rory Parata | Connacht | Ireland | 14-Aug-1994 | 22(126) |
| 10-Dec-2016 | Federico Ruzza | Zebre | Italy | 04-Aug-1994 | 22(129) |
| 11-Dec-2016 | Nicolas Janse van Rensburg | Montpellier | South Africa | 05-Aug-1994 | 22(129) |
| 17-Dec-2016 | Tom Collins | Northampton Saints | England | 03-Jul-1994 | 22(168) |
| 15-Oct-2016 | Gabriele di Giulio | Zebre | Italy | 30-Apr-1994 | 22(169) |
| 15-Oct-2016 | Carolin Blade | Connacht | Ireland | 29-Apr-1994 | 22(170) |
| 11-Dec-2016 | Baptiste Serin | Begles-Bordeaux | France | 20-Jun-1994 | 22(175) |
| 11-Dec-2016 | Jonny Hill | Exeter Chiefs | England | 08-Jun-1994 | 22(187) |
| 15-Oct-2016 | Francois Cros | Toulouse | France | 25-Mar-1994 | 22(205) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).