| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 17-Nov-2017 | Gethin Jenkins | Wales | 17-Nov-1980 | 37(0) |
| 02-Feb-2018 | Damian Welch | Wales | 28-Jul-1982 | 35(190) |
| 11-Nov-2017 | Ben White | Wales | 23-Nov-1983 | 33(354) |
| 02-Feb-2018 | Josh Turnbull | Wales | 12-Mar-1984 | 33(327) |
| 02-Feb-2018 | Rhys Gill | Wales | 30-Oct-1986 | 31(96) |
| 17-Nov-2017 | George Earle | South Africa | 09-Jan-1987 | 30(313) |
| 17-Nov-2017 | Tom James | Wales | 17-Apr-1987 | 30(215) |
| 02-Feb-2018 | James Down | Wales | 29-Aug-1987 | 30(158) |
| 27-Jan-2018 | Anton Peikrishvili | Georgia | 18-Sep-1987 | 30(132) |
| 27-Jan-2018 | Blaine Scully | United States | 29-Feb-1988 | 29(333) |
| 02-Feb-2018 | Ryan Edwards | England | 22-Sep-1990 | 27(133) |
| 02-Feb-2018 | Steve Shingler | Wales | 20-Jun-1991 | 26(228) |
| 02-Feb-2018 | Oliver Robinson | England | 21-Jul-1991 | 26(197) |
| 17-Nov-2017 | Gareth Anscombe | Wales | 10-May-1991 | 26(192) |
| 27-Jan-2018 | Jack Roberts | Wales | 20-Nov-1991 | 26(69) |
| 27-Jan-2018 | Macauley Cook | Wales | 31-Dec-1991 | 26(28) |
| 27-Jan-2018 | Kirby Myhill | Wales | 05-Feb-1992 | 25(357) |
| 02-Feb-2018 | Lewis Jones | Wales | 24-Nov-1992 | 25(70) |
| 11-Nov-2017 | Bradley Thyer | Wales | 07-Feb-1993 | 24(277) |
| 17-Nov-2017 | Sion Bennett | Wales | 27-Nov-1993 | 23(355) |
| 02-Feb-2018 | Ethan Lewis | Wales | 28-Mar-1994 | 23(311) |
| 02-Feb-2018 | Aled Summerhill | Wales | 02-Nov-1994 | 23(92) |
| 02-Feb-2018 | Garyn Smith | Wales | 12-Jul-1995 | 22(206) |
| 27-Jan-2018 | Ben Murphy | Wales | 20-Jan-1996 | 22(8) |
| 02-Feb-2018 | Seb Davies | Wales | 15-May-1996 | 21(263) |
| 27-Jan-2018 | Corey Domachowski | Wales | 19-Sep-1996 | 21(130) |
| 17-Nov-2017 | Harri Millard | Wales | 17-Aug-1996 | 21(92) |
| 02-Feb-2018 | Kieron Assiratti | Wales | 30-Jun-1997 | 20(217) |
| 17-Nov-2017 | Shane Lewis-Hughes | Wales | 20-Sep-1997 | 20(58) |
| 27-Jan-2018 | James Botham | Wales | 22-Feb-1998 | 19(339) |
| 17-Nov-2017 | Owen Lane | Wales | 20-Dec-1997 | 19(332) |
| 27-Jan-2018 | Alun Lawrence | Wales | 12-Aug-1998 | 19(168) |
| 11-Nov-2017 | Dane Blacker | Wales | 06-Jul-1998 | 19(128) |
| 02-Feb-2018 | Corey Howells | Wales | 16-Jul-1999 | 18(202) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).