| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 28-Apr-2018 |  Taufa'ao Filise | Cardiff Blues | Tonga | 26-May-1977 | 40(337) |
| 24-Mar-2018 | Gethin Jenkins | Cardiff Blues | Wales | 17-Nov-1980 | 37(127) |
| 24-Mar-2018 | Matthew Rees | Cardiff Blues | Wales | 09-Dec-1980 | 37(105) |
| 26-Dec-2017 |  Gavin Henson | Gwent Dragons | Wales | 01-Feb-1982 | 35(329) |
| 24-Mar-2018 | Alshaun Bock | Southern Kings | South Africa | 16-May-1982 | 35(313) |
| 28-Apr-2018 | Damian Welch | Cardiff Blues | Wales | 28-Jul-1982 | 35(275) |
| 28-Apr-2018 |  Rory Best | Ulster | Ireland | 15-Aug-1982 | 35(257) |
| 23-Feb-2018 |  Isikeli Nacewa | Leinster | Fiji | 22-Jul-1982 | 35(217) |
| 26-Nov-2017 | Paul James | Ospreys | Wales | 13-May-1982 | 35(198) |
| 28-Apr-2018 | John Muldoon | Connacht | Ireland | 30-Nov-1982 | 35(150) |
| 28-Apr-2018 | Jayden Hayward | Benetton Treviso | Italy | 30-Nov-1982 | 35(150) |
| 02-Dec-2017 |  Mike Phillips | Scarlets | Wales | 29-Aug-1982 | 35(96) |
| 24-Nov-2017 |  Michele Rizzo | Edinburgh Rugby | Italy | 16-Sep-1982 | 35(70) |
| 28-Apr-2018 | Tito Tebaldi | Benetton Treviso | Italy | 24-Mar-1983 | 35(36) |
| 01-Jan-2018 | Robert Kearney | Leinster | Ireland | 26-Mar-1983 | 34(282) |
| 14-Apr-2018 | Nick Williams | Cardiff Blues | New Zealand | 02-Dec-1983 | 34(134) |
| 28-Apr-2018 | Alessandro Zanni | Benetton Treviso | Italy | 31-Jan-1984 | 34(88) |
| 23-Mar-2018 | Neil Cochrane | Edinburgh Rugby | England | 04-Jan-1984 | 34(79) |
| 14-Apr-2018 | Schalk Ferreira | Southern Kings | South Africa | 09-Feb-1984 | 34(65) |
| 28-Apr-2018 | Josh Turnbull | Cardiff Blues | Wales | 12-Mar-1984 | 34(47) |
| 07-Apr-2018 | Valerio Bernabo | Zebre | Italy | 03-Mar-1984 | 34(35) |
| 24-Feb-2018 | Tommy Bowe | Ulster | Ireland | 22-Feb-1984 | 34(3) |
| 23-Mar-2018 | Sarel Pretorius | Gwent Dragons | South Africa | 18-Apr-1984 | 33(339) |
| 28-Apr-2018 | Zane Kirchner | Gwent Dragons | South Africa | 16-Jun-1984 | 33(316) |
| 24-Mar-2018 | Robert Barbieri | Benetton Treviso | Italy | 05-Jun-1984 | 33(292) |
| 24-Mar-2018 | Scott Fardy | Leinster | Australia | 05-Jul-1984 | 33(262) |
| 21-Apr-2018 | Giorgi Nemsadze | Ospreys | Georgia | 26-Sep-1984 | 33(207) |
| 15-Sep-2017 | Ross Ford | Edinburgh Rugby | Scotland | 23-Apr-1984 | 33(145) |
| 28-Apr-2018 | Dries van Schalkwyk | Southern Kings | Italy | 21-Dec-1984 | 33(128) |
| 24-Feb-2018 | Andrew Trimble | Ulster | Ireland | 20-Oct-1984 | 33(127) |
| 28-Apr-2018 | Bradley Davies | Ospreys | Wales | 09-Jan-1985 | 33(109) |
| 14-Apr-2018 | Werner Kruger | Scarlets | South Africa | 23-Jan-1985 | 33(81) |
| 21-Apr-2018 | Jean Roy Deysel | Ulster | South Africa | 05-Mar-1985 | 33(47) |
| 04-Nov-2017 | Chris Henry | Ulster | Ireland | 17-Oct-1984 | 33(18) |
| 16-Mar-2018 | Michael Tagicakibau | Benetton Treviso | Fiji | 09-May-1985 | 32(311) |
| 21-Apr-2018 | James Hook | Ospreys | Wales | 27-Jun-1985 | 32(298) |
| 01-Dec-2017 | Juan Harris | Gwent Dragons | South Africa | 22-Feb-1985 | 32(282) |
| 13-Apr-2018 |  Billy Holland | Munster | Ireland | 03-Aug-1985 | 32(253) |
| 14-Apr-2018 | Tom Varndell | Scarlets | England | 16-Aug-1985 | 32(241) |
| 28-Apr-2018 | Alan Wyn Jones | Ospreys | Wales | 19-Sep-1985 | 32(221) |
| 13-Apr-2018 | Tom McCartney | Connacht | New Zealand | 06-Sep-1985 | 32(219) |
| 28-Apr-2018 | George Fabio Biagi | Zebre | Italy | 04-Oct-1985 | 32(206) |
| 04-Nov-2017 | Brendon Leonard | Ospreys | New Zealand | 16-Apr-1985 | 32(202) |
| 01-Jan-2018 | Jonathan Sexton | Leinster | Ireland | 11-Jul-1985 | 32(174) |
| 01-Dec-2017 | Paul Marshall | Ulster | Ireland | 26-Jul-1985 | 32(128) |
| 16-Feb-2018 | Robert McCusker | Ospreys | Wales | 12-Oct-1985 | 32(127) |
| 14-Apr-2018 | Richard Strauss | Leinster | Ireland | 29-Jan-1986 | 32(75) |
| 28-Apr-2018 | Callum Black | Ulster | England | 25-Feb-1986 | 32(62) |
| 14-Apr-2018 | Reynold Lee-lo | Cardiff Blues | Samoa | 28-Feb-1986 | 32(45) |
| 23-Dec-2017 | Robert Diack | Ulster | Ireland | 12-Nov-1985 | 32(41) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).