| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 12-Oct-2018 | Jordan Larmour | Ireland | 10-Jun-1997 | 21(124) |
| 12-Oct-2018 | James Ryan | Ireland | 24-Jul-1996 | 22(80) |
| 12-Oct-2018 | Gary Ringrose | Ireland | 26-Jan-1995 | 23(259) |
| 12-Jan-2019 | Ross Byrne | Ireland | 08-Apr-1995 | 23(279) |
| 12-Oct-2018 | Dan Leavy | Ireland | 23-May-1994 | 24(142) |
| 15-Dec-2018 | Adam Byrne | Ireland | 10-Apr-1994 | 24(249) |
| 15-Dec-2018 | Rory O'Loughlin | Ireland | 21-Jan-1994 | 24(328) |
| 12-Oct-2018 | Robbie Henshaw | Ireland | 12-Jun-1993 | 25(122) |
| 12-Oct-2018 | Josh van der Flier | Ireland | 25-Apr-1993 | 25(170) |
| 12-Oct-2018 | Luke McGrath | Ireland | 03-Feb-1993 | 25(251) |
| 12-Oct-2018 | Tadhg Furlong | Ireland | 14-Nov-1992 | 25(332) |
| 12-Oct-2018 | Jack Conan | Ireland | 29-Jul-1992 | 26(75) |
| 12-Oct-2018 | James Lowe | Wales | 08-Jul-1992 | 26(96) |
| 20-Jan-2019 | Jamieson Gibson-Park | Ireland | 10-May-1992 | 26(255) |
| 21-Oct-2018 | Rhys Ruddock | Ireland | 13-Oct-1990 | 28(8) |
| 08-Dec-2018 | Noel Reid | Ireland | 22-May-1990 | 28(200) |
| 21-Oct-2018 | Joseph Tomane | Australia | 11-Feb-1990 | 28(252) |
| 20-Jan-2019 | Jack McGrath | Ireland | 11-Oct-1989 | 29(101) |
| 12-Jan-2019 | David Kearney | Ireland | 19-Jun-1989 | 29(207) |
| 12-Oct-2018 | Cian Healy | Ireland | 07-Oct-1987 | 31(6) |
| 20-Jan-2019 | Sean O'Brien | Ireland | 14-Feb-1987 | 31(341) |
| 12-Oct-2018 | Devin Toner | Ireland | 29-Jun-1986 | 32(105) |
| 12-Oct-2018 | Sean Cronin | Ireland | 06-May-1986 | 32(159) |
| 12-Oct-2018 | Jonathan Sexton | Ireland | 11-Jul-1985 | 33(93) |
| 12-Jan-2019 | Scott Fardy | Australia | 05-Jul-1984 | 34(191) |
| 12-Oct-2018 | Robert Kearney | Ireland | 26-Mar-1983 | 35(201) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).