| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 03-Feb-2018 | James Ryan | Ireland | 24-Jul-1996 | 21(194) |
| 03-Feb-2018 | Jacob Stockdale | Ireland | 03-Apr-1996 | 21(306) |
| 24-Feb-2018 | Andrew Porter | Ireland | 16-Jan-1996 | 22(40) |
| 10-Mar-2018 | Gary Ringrose | Ireland | 26-Jan-1995 | 23(43) |
| 10-Feb-2018 | Dan Leavy | Ireland | 23-May-1994 | 23(263) |
| 03-Feb-2018 | Robbie Henshaw | Ireland | 12-Jun-1993 | 24(236) |
| 03-Feb-2018 | Josh van der Flier | Ireland | 25-Apr-1993 | 24(284) |
| 24-Feb-2018 | Chris Farrell | Ireland | 16-Mar-1993 | 24(345) |
| 03-Feb-2018 | Tadhg Furlong | Ireland | 14-Nov-1992 | 25(81) |
| 10-Feb-2018 | Jack Conan | Ireland | 29-Jul-1992 | 25(196) |
| 03-Feb-2018 | Iain Henderson | Ireland | 21-Feb-1992 | 25(348) |
| 03-Feb-2018 | Bundee Aki | Ireland | 07-Apr-1990 | 27(302) |
| 03-Feb-2018 | CJ Stander | Ireland | 05-Apr-1990 | 27(304) |
| 10-Feb-2018 | Jack McGrath | Ireland | 11-Oct-1989 | 28(122) |
| 03-Feb-2018 | Peter O'Mahony | Ireland | 17-Sep-1989 | 28(139) |
| 03-Feb-2018 | Conor Murray | Ireland | 20-Apr-1989 | 28(289) |
| 03-Feb-2018 | Cian Healy | Ireland | 07-Oct-1987 | 30(120) |
| 03-Feb-2018 | Keith Earls | Ireland | 02-Oct-1987 | 30(125) |
| 10-Feb-2018 | Devin Toner | Ireland | 29-Jun-1986 | 31(226) |
| 03-Feb-2018 | Jonathan Sexton | Ireland | 11-Jul-1985 | 32(207) |
| 03-Feb-2018 | Robert Kearney | Ireland | 26-Mar-1983 | 34(315) |
| 03-Feb-2018 | Rory Best | Ireland | 15-Aug-1982 | 35(173) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).