| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 11-Mar-2018 | Owen Watkin | Wales | 12-Oct-1996 | 21(150) |
| 03-Feb-2018 | Josh Adams | Wales | 21-Apr-1995 | 22(289) |
| 03-Feb-2018 | Steffan Evans | Wales | 01-Sep-1994 | 23(155) |
| 03-Feb-2018 | Ross Moriarty | Wales | 18-Apr-1994 | 23(291) |
| 11-Mar-2018 | Nicky Smith | Wales | 07-Apr-1994 | 23(338) |
| 11-Mar-2018 | Elliott Dee | Wales | 07-Mar-1994 | 24(4) |
| 03-Feb-2018 | Rhys Patchell | Wales | 17-May-1993 | 24(262) |
| 03-Feb-2018 | Samson Lee | Wales | 30-Nov-1992 | 25(65) |
| 03-Feb-2018 | Rob Evans | Wales | 14-Apr-1992 | 25(295) |
| 11-Mar-2018 | Tomas Francis | Wales | 27-Apr-1992 | 25(318) |
| 11-Mar-2018 | George North | Wales | 13-Apr-1992 | 25(332) |
| 03-Feb-2018 | Cory Hill | Wales | 10-Feb-1992 | 25(359) |
| 11-Mar-2018 | Gareth Anscombe | Wales | 10-May-1991 | 26(306) |
| 24-Feb-2018 | Liam Williams | Wales | 09-Apr-1991 | 26(322) |
| 03-Feb-2018 | Josh Navidi | Wales | 30-Dec-1990 | 27(35) |
| 03-Feb-2018 | Scott Williams | Wales | 10-Oct-1990 | 27(116) |
| 11-Mar-2018 | Toby Faletau | Wales | 12-Nov-1990 | 27(119) |
| 11-Mar-2018 | James Davies | Wales | 25-Oct-1990 | 27(137) |
| 03-Feb-2018 | Gareth Davies | Wales | 18-Aug-1990 | 27(169) |
| 24-Feb-2018 | Daniel Biggar | Wales | 16-Oct-1989 | 28(131) |
| 11-Mar-2018 | Justin Tipuric | Wales | 06-Aug-1989 | 28(217) |
| 03-Feb-2018 | Leigh Halfpenny | Wales | 22-Dec-1988 | 29(43) |
| 03-Feb-2018 | Hadleigh Parkes | Wales | 05-Oct-1987 | 30(122) |
| 03-Feb-2018 | Aaron Shingler | Wales | 07-Aug-1987 | 30(181) |
| 03-Feb-2018 | Ken Owens | Wales | 03-Jan-1987 | 31(31) |
| 03-Feb-2018 | Alan Wyn Jones | Wales | 19-Sep-1985 | 32(137) |
| 11-Mar-2018 | Bradley Davies | Wales | 09-Jan-1985 | 33(61) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).