| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 27-Sep-1998 |  Ryan Powell | Ebbw Vale | Wales | 01-Jul-1980 | 18(88) |
| 31-Oct-1998 | Matthew Taylor | Pontypridd | Other | 03-Mar-1980 | 18(242) |
| 10-Oct-1998 |  Daniel Rogers | Scarlets | Wales | 10-Jan-1980 | 18(274) |
| 19-Sep-1998 | Luke Richards | Neath | Other | 27-Sep-1979 | 18(358) |
| 17-Oct-1998 |  Frederic Cermano | Perpignan | Other | 20-Jun-1979 | 19(119) |
| 10-Oct-1998 |  Donncha O'Callaghan | Munster | Ireland | 24-Mar-1979 | 19(200) |
| 26-Sep-1998 | David Skrela | Colomiers | France | 02-Mar-1979 | 19(208) |
| 10-Oct-1998 | Chris Landry | Ebbw Vale | Other | 15-Mar-1979 | 19(209) |
| 26-Sep-1998 | Michael O'Driscoll | Munster | Ireland | 08-Oct-1978 | 19(353) |
| 27-Sep-1998 | Gareth Mason | Ebbw Vale | Wales | 11-Sep-1978 | 20(16) |
| 17-Oct-1998 | Duncan Jones | Neath | Wales | 18-Sep-1978 | 20(29) |
| 19-Sep-1998 | Marco Baroni | Padova | Italy | 15-Aug-1978 | 20(35) |
| 19-Sep-1998 |  Shane Horgan | Leinster | Ireland | 18-Jul-1978 | 20(63) |
| 09-Oct-1998 | Mike Price | Pontypridd | Other | 17-Jul-1978 | 20(84) |
| 19-Sep-1998 | Jason White | Glasgow Warriors | Scotland | 17-Apr-1978 | 20(155) |
| 19-Sep-1998 | Denis Dallan | Benetton Treviso | Italy | 04-Mar-1978 | 20(199) |
| 16-Oct-1998 |  William Servat | Toulouse | France | 09-Feb-1978 | 20(249) |
| 19-Sep-1998 | Stephen Jones | Scarlets | Wales | 08-Dec-1977 | 20(285) |
| 19-Sep-1998 | David Gerard | Begles-Bordeaux | France | 26-Nov-1977 | 20(297) |
| 19-Sep-1998 | Raphael Bastide | Colomiers | France | 24-Nov-1977 | 20(299) |
| 10-Oct-1998 | Peter Stringer | Munster | Ireland | 13-Dec-1977 | 20(301) |
| 19-Sep-1998 | Scott Palmer | Begles-Bordeaux | France | 10-Nov-1977 | 20(313) |
| 11-Oct-1998 | Julien Tilloles | Toulouse | France | 29-Oct-1977 | 20(347) |
| 10-Oct-1998 | Richard Francis | Neath | Other | 26-Sep-1977 | 21(14) |
| 19-Sep-1998 | Mathieu Barrau | Perpignan | France | 03-Sep-1977 | 21(16) |
| 25-Oct-1998 | Manuel Bergamo | Benetton Treviso | Italy | 20-Jul-1977 | 21(97) |
| 26-Sep-1998 | Vernon Cooper | Scarlets | Wales | 12-Jun-1977 | 21(106) |
| 07-Nov-1998 | Alan Bulloch | Glasgow Warriors | Scotland | 07-Jul-1977 | 21(123) |
| 19-Sep-1998 |  Jamie Mayer | Edinburgh Rugby | Scotland | 16-Apr-1977 | 21(156) |
| 19-Sep-1998 | Olivier Olibeau | Perpignan | France | 13-Apr-1977 | 21(159) |
| 19-Sep-1998 | Rhys Shorney | Pontypridd | Other | 28-Mar-1977 | 21(175) |
| 10-Oct-1998 | Benjamin Lhande | Colomiers | France | 29-Mar-1977 | 21(195) |
| 19-Sep-1998 | Ronan O'Gara | Munster | Ireland | 07-Mar-1977 | 21(196) |
| 19-Sep-1998 | Gareth Wyatt | Pontypridd | Wales | 04-Mar-1977 | 21(199) |
| 19-Sep-1998 | James Craig | Glasgow Warriors | Scotland | 02-Mar-1977 | 21(201) |
| 10-Oct-1998 | Darren Case | Neath | Wales | 28-Feb-1977 | 21(224) |
| 19-Sep-1998 |  Sheldon Coulter | Ulster | Ireland | 01-Feb-1977 | 21(230) |
| 17-Oct-1998 | Kevin Morgan | Pontypridd | Wales | 23-Feb-1977 | 21(236) |
| 26-Sep-1998 | Geraint John | Scarlets | Wales | 03-Jan-1977 | 21(266) |
| 19-Sep-1998 | Iestyn Thomas | Ebbw Vale | Wales | 15-Dec-1976 | 21(278) |
| 27-Sep-1998 | Laurent Salies | Perpignan | France | 17-Dec-1976 | 21(284) |
| 19-Sep-1998 | Anthony Horgan | Munster | Ireland | 15-Nov-1976 | 21(308) |
| 19-Sep-1998 | Ian Gough | Pontypridd | Wales | 10-Nov-1976 | 21(313) |
| 19-Sep-1998 | Nicolas Spanghero | Toulouse | France | 21-Oct-1976 | 21(333) |
| 07-Nov-1998 | Xavier Garbajosa | Toulouse | France | 05-Dec-1976 | 21(337) |
| 10-Oct-1998 | Delme Williams | Neath | Other | 25-Oct-1976 | 21(350) |
| 19-Sep-1998 | Graeme McCallum | Edinburgh Rugby | Scotland | 03-Oct-1976 | 21(351) |
| 26-Sep-1998 | Tristan Davies | Neath | Wales | 07-Oct-1976 | 21(354) |
| 19-Sep-1998 | Tom Tierney | Munster | Ireland | 01-Sep-1976 | 22(18) |
| 31-Oct-1998 | Iain Sinclair | Edinburgh Rugby | Scotland | 07-Oct-1976 | 22(24) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).