| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 03-Sep-2016 | Josh Macleod | Wales | 27-Oct-1996 | 19(311) |
| 06-Jan-2017 | Daniel Jones | Wales | 07-Jan-1996 | 20(365) |
| 28-Oct-2016 | Ryan Elias | Wales | 07-Jan-1995 | 21(295) |
| 28-Oct-2016 | Will Boyde | Wales | 15-Dec-1994 | 21(318) |
| 03-Sep-2016 | Steffan Evans | Wales | 01-Sep-1994 | 22(3) |
| 28-Oct-2016 | Steffan Hughes | Wales | 17-Feb-1994 | 22(254) |
| 03-Sep-2016 | Rhys Patchell | Wales | 17-May-1993 | 23(109) |
| 28-Oct-2016 | Tom Price | England | 22-Jan-1993 | 23(279) |
| 01-Oct-2016 | Samson Lee | Wales | 30-Nov-1992 | 23(305) |
| 09-Sep-2016 | Aled Davies | Wales | 19-Jul-1992 | 24(52) |
| 28-Oct-2016 | Jonathan Evans | Wales | 25-Jul-1992 | 24(95) |
| 03-Dec-2016 | Tadhg Beirne | Ireland | 01-Aug-1992 | 24(124) |
| 09-Sep-2016 | Wyn Jones | Wales | 26-Feb-1992 | 24(196) |
| 27-Dec-2016 | Rob Evans | Wales | 14-Apr-1992 | 24(257) |
| 03-Sep-2016 | Jake Ball | Wales | 21-Jun-1991 | 25(75) |
| 03-Sep-2016 | Liam Williams | Wales | 09-Apr-1991 | 25(148) |
| 10-Feb-2017 | Tom Williams | Wales | 02-Apr-1991 | 25(315) |
| 09-Sep-2016 | James Davies | Wales | 25-Oct-1990 | 25(320) |
| 03-Sep-2016 | Scott Williams | Wales | 10-Oct-1990 | 25(329) |
| 03-Sep-2016 | Gareth Davies | Wales | 18-Aug-1990 | 26(17) |
| 25-Nov-2016 | Johnny McNicholl | Wales | 24-Sep-1990 | 26(63) |
| 03-Sep-2016 | Lewis Rawlins | Wales | 13-Apr-1990 | 26(144) |
| 08-Oct-2016 | Morgan Allen | Wales | 12-Mar-1990 | 26(211) |
| 09-Sep-2016 | David Bulbring | South Africa | 12-Sep-1989 | 26(363) |
| 03-Sep-2016 | Dylan Evans | Australia | 25-Jan-1989 | 27(221) |
| 10-Feb-2017 | Gareth Owen | Wales | 05-Nov-1988 | 28(97) |
| 09-Sep-2016 | Jon Davies | Wales | 05-Apr-1988 | 28(157) |
| 03-Sep-2016 | Hadleigh Parkes | Wales | 05-Oct-1987 | 28(334) |
| 03-Sep-2016 | Aaron Shingler | Wales | 07-Aug-1987 | 29(28) |
| 03-Sep-2016 | Ken Owens | Wales | 03-Jan-1987 | 29(244) |
| 03-Sep-2016 | John Barclay | Scotland | 24-Sep-1986 | 29(345) |
| 17-Feb-2017 | Emyr Phillips | Wales | 22-Feb-1987 | 29(361) |
| 03-Sep-2016 | Daniel Van Der Merwe | Canada | 28-Apr-1986 | 30(129) |
| 03-Sep-2016 | Werner Kruger | South Africa | 23-Jan-1985 | 31(223) |
| 16-Sep-2016 | Aled Thomas | Wales | 02-Jan-1985 | 31(257) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).