| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 19-May-2018 | Jordan Larmour | Ireland | 10-Jun-1997 | 20(343) |
| 19-May-2018 | James Ryan | Ireland | 24-Jul-1996 | 21(299) |
| 19-May-2018 | Joey Carbery | Ireland | 01-Nov-1995 | 22(200) |
| 19-May-2018 | Ross Byrne | Ireland | 08-Apr-1995 | 23(41) |
| 19-May-2018 | Gary Ringrose | Ireland | 26-Jan-1995 | 23(113) |
| 26-May-2018 | Dan Leavy | Ireland | 23-May-1994 | 24(3) |
| 19-May-2018 | Luke McGrath | Ireland | 03-Feb-1993 | 25(105) |
| 19-May-2018 | Tadhg Furlong | Ireland | 14-Nov-1992 | 25(186) |
| 19-May-2018 | Jack Conan | Ireland | 29-Jul-1992 | 25(294) |
| 19-May-2018 | James Lowe | Wales | 08-Jul-1992 | 25(315) |
| 19-May-2018 | Jordi Murphy | Ireland | 22-Apr-1991 | 27(27) |
| 19-May-2018 | Rhys Ruddock | Ireland | 13-Oct-1990 | 27(218) |
| 19-May-2018 | Jack McGrath | Ireland | 11-Oct-1989 | 28(220) |
| 26-May-2018 | Cian Healy | Ireland | 07-Oct-1987 | 30(232) |
| 19-May-2018 | Devin Toner | Ireland | 29-Jun-1986 | 31(324) |
| 19-May-2018 | Sean Cronin | Ireland | 06-May-1986 | 32(13) |
| 26-May-2018 | Jonathan Sexton | Ireland | 11-Jul-1985 | 32(319) |
| 26-May-2018 | Robert Kearney | Ireland | 26-Mar-1983 | 35(62) |
| 19-May-2018 | Isikeli Nacewa | Fiji | 22-Jul-1982 | 35(302) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).