| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 04-Jun-2021 |  Mac Grealy | Queensland Reds | Australia | 06-Mar-2002 | 19(90) |
| 14-May-2021 | Ruban Love | Hurricanes | New Zealand | 28-Apr-2001 | 20(16) |
| 21-May-2021 | Carter Gordon | Melbourne Rebels | Australia | 29-Jan-2001 | 20(112) |
| 15-May-2021 | Josh Lord | Chiefs | New Zealand | 17-Jan-2001 | 20(118) |
| 11-Jun-2021 | Cameron Roigard | Hurricanes | New Zealand | 16-Nov-2000 | 20(207) |
| 15-May-2021 | Zarn Sullivan | Blues | New Zealand | 07-Oct-2000 | 20(220) |
| 14-May-2021 | Gus Bell | New South Wales | Australia | 04-Oct-2000 | 20(222) |
| 14-May-2021 | Mark Nawaqanitawase | New South Wales | Australia | 11-Sep-2000 | 20(245) |
| 04-Jun-2021 | Tamaiti Williams | Crusaders | New Zealand | 10-Aug-2000 | 20(298) |
| 04-Jun-2021 | Ollie Callan | Western Force | Australia | 20-Jul-2000 | 20(319) |
| 14-May-2021 | Will Harris | New South Wales | Australia | 08-Jun-2000 | 20(340) |
| 15-May-2021 | Tupou Vaai | Chiefs | New Zealand | 27-Jan-2000 | 21(109) |
| 05-Jun-2021 | Carlo Tizzano | New South Wales | Australia | 02-Feb-2000 | 21(124) |
| 14-May-2021 | Max Douglas | New South Wales | Australia | 01-Jan-2000 | 21(134) |
| 15-May-2021 | Cullen Grace | Crusaders | New Zealand | 20-Dec-1999 | 21(147) |
| 15-May-2021 | Noah Lolesio | Brumbies | Australia | 18-Dec-1999 | 21(149) |
| 21-May-2021 | Trevor Hosea | Melbourne Rebels | Australia | 24-Nov-1999 | 21(179) |
| 22-May-2021 | Harry Wilson | Queensland Reds | Australia | 22-Nov-1999 | 21(182) |
| 15-May-2021 | Leicester Faingaanuku | Crusaders | New Zealand | 11-Oct-1999 | 21(217) |
| 15-May-2021 | Nick Frost | Brumbies | Australia | 10-Oct-1999 | 21(218) |
| 22-May-2021 | Lachlan Lonergan | Brumbies | Australia | 11-Oct-1999 | 21(224) |
| 04-Jun-2021 | Fergus Burke | Crusaders | New Zealand | 03-Sep-1999 | 21(275) |
| 22-May-2021 | Will Harrison | New South Wales | Australia | 30-Jul-1999 | 21(297) |
| 14-May-2021 | Devan Flanders | Hurricanes | New Zealand | 20-Jul-1999 | 21(299) |
| 14-May-2021 | Billy Proctor | Hurricanes | New Zealand | 14-May-1999 | 22(1) |
| 06-Jun-2021 | Quinn Tupaea | Chiefs | New Zealand | 10-May-1999 | 22(28) |
| 29-May-2021 | Dallas McLeod | Crusaders | New Zealand | 30-Apr-1999 | 22(30) |
| 05-Jun-2021 | Darcy Breen | New South Wales | Australia | 28-Apr-1999 | 22(39) |
| 14-May-2021 | Ben Donaldson | New South Wales | Australia | 04-Apr-1999 | 22(41) |
| 29-May-2021 | Isaac Henry | Queensland Reds | Australia | 08-Mar-1999 | 22(83) |
| 22-May-2021 | Fraser McReight | Queensland Reds | Australia | 19-Feb-1999 | 22(93) |
| 14-May-2021 | Sam Gilbert | Highlanders | New Zealand | 23-Jan-1999 | 22(112) |
| 29-May-2021 | Kaleb Trask | Chiefs | New Zealand | 27-Jan-1999 | 22(123) |
| 14-May-2021 | Scott Gregory | Highlanders | New Zealand | 07-Jan-1999 | 22(128) |
| 14-May-2021 | Xavier Numia | Hurricanes | New Zealand | 29-Nov-1998 | 22(167) |
| 15-May-2021 | Josh Kemeny | Melbourne Rebels | Australia | 29-Nov-1998 | 22(168) |
| 06-Jun-2021 | Xavier Roe | Chiefs | New Zealand | 13-Dec-1998 | 22(176) |
| 15-May-2021 | Len Ikitau | Brumbies | Australia | 01-Oct-1998 | 22(227) |
| 22-May-2021 | Tata McDermott | Queensland Reds | Australia | 18-Sep-1998 | 22(247) |
| 29-May-2021 | Bradley Slater | Chiefs | New Zealand | 23-Sep-1998 | 22(249) |
| 15-May-2021 | Robert Valetini | Brumbies | Australia | 03-Sep-1998 | 22(255) |
| 22-May-2021 | Bailyn Sullivan | Chiefs | New Zealand | 03-Sep-1998 | 22(262) |
| 15-May-2021 | Cabous Eloff | Melbourne Rebels | South Africa | 30-Jul-1998 | 22(290) |
| 15-May-2021 | AJ Lam | Blues | New Zealand | 29-Jul-1998 | 22(291) |
| 15-May-2021 | Hoskins Sotutu | Blues | New Zealand | 12-Jul-1998 | 22(308) |
| 30-May-2021 | Ethan da Groot | Highlanders | New Zealand | 22-Jul-1998 | 22(313) |
| 22-May-2021 | Oli Jager | Crusaders | New Zealand | 05-Jul-1998 | 22(322) |
| 05-Jun-2021 | Bayley Kuenzle | Brumbies | Australia | 18-Jun-1998 | 22(353) |
| 15-May-2021 | Jordan Olowofela | Western Force | England | 07-Apr-1998 | 23(38) |
| 15-May-2021 | Ryan Lonergan | Brumbies | Australia | 06-Apr-1998 | 23(39) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).