| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 29-Oct-2016 | Keelan Giles | Wales | 29-Jan-1998 | 18(274) |
| 25-Nov-2016 | Sam Underhill | England | 22-Jul-1996 | 20(126) |
| 29-Oct-2016 | Adam Beard | Wales | 07-Jan-1996 | 20(296) |
| 10-Feb-2017 | Luke Price | Wales | 26-Sep-1995 | 21(138) |
| 02-Sep-2016 | Rory Thornton | Wales | 16-Mar-1995 | 21(171) |
| 17-Sep-2016 | Dafydd Howells | Wales | 22-Mar-1995 | 21(180) |
| 02-Sep-2016 | Oliver Cracknell | Wales | 26-May-1994 | 22(100) |
| 02-Sep-2016 | Nicky Smith | Wales | 07-Apr-1994 | 22(149) |
| 02-Sep-2016 | Sam Davies | Wales | 06-Oct-1993 | 22(332) |
| 01-Oct-2016 | Dan Baker | Wales | 05-Jul-1992 | 24(88) |
| 02-Sep-2016 | Tom Habberfield | Wales | 19-May-1992 | 24(106) |
| 02-Sep-2016 | Eli Walker | Wales | 28-Mar-1992 | 24(158) |
| 02-Sep-2016 | Sam Parry | Wales | 17-Dec-1991 | 24(260) |
| 02-Sep-2016 | Jeff Hassler | Canada | 21-Aug-1991 | 25(13) |
| 10-Feb-2017 | Rhodri Jones | Wales | 23-Dec-1991 | 25(50) |
| 02-Sep-2016 | Tyler Ardron | Canada | 16-Jun-1991 | 25(79) |
| 25-Nov-2016 | Tom Grabham | Wales | 20-Jun-1991 | 25(159) |
| 10-Sep-2016 | Ben John | Wales | 28-Feb-1991 | 25(195) |
| 02-Sep-2016 | Lloyd Ashley | Wales | 02-Feb-1991 | 25(213) |
| 01-Jan-2017 | Hanno Dirksen | South Africa | 31-Mar-1991 | 25(277) |
| 02-Sep-2016 | Josh Matavasi | Fiji | 05-Oct-1990 | 25(333) |
| 17-Sep-2016 | James King | Wales | 24-Jul-1990 | 26(56) |
| 02-Sep-2016 | Ashley Beck | Wales | 15-Apr-1990 | 26(141) |
| 23-Sep-2016 | Daniel Biggar | Wales | 16-Oct-1989 | 26(343) |
| 25-Nov-2016 | Ma'afu Fia | Tonga | 22-Nov-1989 | 27(3) |
| 02-Sep-2016 | Justin Tipuric | Wales | 06-Aug-1989 | 27(27) |
| 10-Sep-2016 | Rhys Webb | Wales | 09-Dec-1988 | 27(275) |
| 02-Sep-2016 | Daniel Evans | Wales | 15-Nov-1988 | 27(291) |
| 02-Sep-2016 | Dimitri Arhip | Moldova | 12-Nov-1988 | 27(294) |
| 23-Sep-2016 | Scott Baldwin | Wales | 12-Jul-1988 | 28(73) |
| 25-Nov-2016 | Kieron Fonotia | Samoa | 02-Feb-1988 | 28(297) |
| 29-Oct-2016 | Dan Lydiatt | Wales | 18-Dec-1987 | 28(316) |
| 26-Feb-2017 | Huw Gustafson | Wales | 08-Jul-1987 | 29(234) |
| 23-Sep-2016 | Alan Wyn Jones | Wales | 19-Sep-1985 | 31(4) |
| 04-Nov-2016 | Robert McCusker | Wales | 12-Oct-1985 | 31(23) |
| 02-Dec-2016 | Brendon Leonard | New Zealand | 16-Apr-1985 | 31(231) |
| 10-Sep-2016 | Bradley Davies | Wales | 09-Jan-1985 | 31(244) |
| 26-Feb-2017 | Brian Mujati | South Africa | 28-Sep-1984 | 32(151) |
| 17-Sep-2016 | Paul James | Wales | 13-May-1982 | 34(128) |
| 29-Oct-2016 | Joe Bearman | England | 28-Feb-1979 | 37(244) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).