| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 24-Feb-2018 | Corey Baldwin | Wales | 13-Oct-1999 | 18(135) |
| 09-Mar-2018 | Ryan Conbeer | Wales | 05-Feb-1999 | 19(32) |
| 26-Nov-2017 | Ioan Nicholas | Wales | 03-Apr-1998 | 19(237) |
| 29-Sep-2017 | Josh Macleod | Wales | 27-Oct-1996 | 20(337) |
| 03-Nov-2017 | Daniel Jones | Wales | 07-Jan-1996 | 21(301) |
| 02-Sep-2017 | Ryan Elias | Wales | 07-Jan-1995 | 22(239) |
| 09-Sep-2017 | Will Boyde | Wales | 15-Dec-1994 | 22(269) |
| 02-Sep-2017 | Steffan Evans | Wales | 01-Sep-1994 | 23(1) |
| 26-Nov-2017 | Steffan Hughes | Wales | 17-Feb-1994 | 23(282) |
| 07-Oct-2017 | Paul Asquith | Australia | 08-Dec-1993 | 23(303) |
| 02-Sep-2017 | Rhys Patchell | Wales | 17-May-1993 | 24(108) |
| 02-Sep-2017 | Samson Lee | Wales | 30-Nov-1992 | 24(276) |
| 02-Sep-2017 | Tadhg Beirne | Ireland | 01-Aug-1992 | 25(32) |
| 03-Nov-2017 | Jonathan Evans | Wales | 25-Jul-1992 | 25(101) |
| 02-Sep-2017 | Rob Evans | Wales | 14-Apr-1992 | 25(141) |
| 05-Jan-2018 | Aled Davies | Wales | 19-Jul-1992 | 25(170) |
| 07-Oct-2017 | Wyn Jones | Wales | 26-Feb-1992 | 25(224) |
| 03-Nov-2017 | Tom Prydie | Wales | 23-Feb-1992 | 25(254) |
| 31-Dec-2017 | Steven Cummins | Australia | 29-Mar-1992 | 25(277) |
| 02-Sep-2017 | Jake Ball | Wales | 21-Jun-1991 | 26(74) |
| 09-Sep-2017 | Tom Grabham | Wales | 20-Jun-1991 | 26(82) |
| 02-Sep-2017 | James Davies | Wales | 25-Oct-1990 | 26(313) |
| 02-Sep-2017 | Scott Williams | Wales | 10-Oct-1990 | 26(328) |
| 24-Feb-2018 | Tom Williams | Wales | 02-Apr-1991 | 26(329) |
| 02-Sep-2017 | Johnny McNicholl | Wales | 24-Sep-1990 | 26(344) |
| 02-Sep-2017 | Gareth Davies | Wales | 18-Aug-1990 | 27(15) |
| 07-Oct-2017 | Lewis Rawlins | Wales | 13-Apr-1990 | 27(177) |
| 09-Sep-2017 | David Bulbring | South Africa | 12-Sep-1989 | 27(362) |
| 02-Sep-2017 | Leigh Halfpenny | Wales | 22-Dec-1988 | 28(254) |
| 03-Nov-2017 | Dylan Evans | Australia | 25-Jan-1989 | 28(282) |
| 09-Mar-2018 | Phil Price | Wales | 10-Nov-1988 | 29(119) |
| 23-Sep-2017 | Jon Davies | Wales | 05-Apr-1988 | 29(171) |
| 02-Sep-2017 | Hadleigh Parkes | Wales | 05-Oct-1987 | 29(333) |
| 02-Sep-2017 | Aaron Shingler | Wales | 07-Aug-1987 | 30(27) |
| 14-Apr-2018 | Geraint Rhys Jones | Wales | 23-Aug-1987 | 30(235) |
| 15-Sep-2017 | Ken Owens | Wales | 03-Jan-1987 | 30(256) |
| 02-Sep-2017 | John Barclay | Scotland | 24-Sep-1986 | 30(344) |
| 24-Mar-2018 | Tom Varndell | England | 16-Aug-1985 | 32(220) |
| 29-Sep-2017 | Werner Kruger | South Africa | 23-Jan-1985 | 32(249) |
| 02-Dec-2017 | Mike Phillips | Wales | 29-Aug-1982 | 35(96) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).