| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 01-Jul-2017 | Maro Itoje | England | 28-Oct-1994 | 22(247) |
| 24-Jun-2017 | Anthony Watson | England | 26-Feb-1994 | 23(118) |
| 24-Jun-2017 | Tadhg Furlong | Ireland | 14-Nov-1992 | 24(222) |
| 24-Jun-2017 | Elliot Daly | England | 08-Oct-1992 | 24(259) |
| 24-Jun-2017 | Owen Farrell | England | 21-Sep-1991 | 25(277) |
| 24-Jun-2017 | Liam Williams | Wales | 09-Apr-1991 | 26(77) |
| 24-Jun-2017 | Makovina Vunipola | England | 13-Jan-1991 | 26(163) |
| 24-Jun-2017 | Toby Faletau | Wales | 12-Nov-1990 | 26(225) |
| 24-Jun-2017 | Jamie George | England | 20-Oct-1990 | 26(248) |
| 24-Jun-2017 | George Kruis | England | 22-Feb-1990 | 27(122) |
| 24-Jun-2017 | Peter O'Mahony | Ireland | 17-Sep-1989 | 27(280) |
| 24-Jun-2017 | Conor Murray | Ireland | 20-Apr-1989 | 28(65) |
| 01-Jul-2017 | Sam Warburton | Wales | 05-Oct-1988 | 28(269) |
| 24-Jun-2017 | Jon Davies | Wales | 05-Apr-1988 | 29(80) |
| 24-Jun-2017 | Sean O'Brien | Ireland | 14-Feb-1987 | 30(131) |
| 24-Jun-2017 | Ben Te'o | England | 27-Jan-1987 | 30(149) |
| 24-Jun-2017 | Alan Wyn Jones | Wales | 19-Sep-1985 | 31(278) |
| 01-Jul-2017 | Jonathan Sexton | Ireland | 11-Jul-1985 | 31(355) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).