| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 10-Aug-2019 | Jordan Larmour | Ireland | 10-Jun-1997 | 22(61) |
| 31-Aug-2019 | James Ryan | Ireland | 24-Jul-1996 | 23(37) |
| 24-Aug-2019 | Jacob Stockdale | Ireland | 03-Apr-1996 | 23(142) |
| 10-Aug-2019 | Andrew Porter | Ireland | 16-Jan-1996 | 23(206) |
| 10-Aug-2019 | Joey Carbery | Ireland | 01-Nov-1995 | 23(282) |
| 24-Aug-2019 | Ross Byrne | Ireland | 08-Apr-1995 | 24(138) |
| 10-Aug-2019 | Gary Ringrose | Ireland | 26-Jan-1995 | 24(196) |
| 10-Aug-2019 | Jean Kleyn | South Africa | 26-Aug-1993 | 25(349) |
| 07-Sep-2019 | Robbie Henshaw | Ireland | 12-Jun-1993 | 26(87) |
| 24-Aug-2019 | Josh van der Flier | Ireland | 25-Apr-1993 | 26(121) |
| 10-Aug-2019 | Chris Farrell | Ireland | 16-Mar-1993 | 26(147) |
| 10-Aug-2019 | Luke McGrath | Ireland | 03-Feb-1993 | 26(188) |
| 24-Aug-2019 | Tadhg Furlong | Ireland | 14-Nov-1992 | 26(283) |
| 31-Aug-2019 | Jack Carty | Ireland | 31-Aug-1992 | 26(365) |
| 31-Aug-2019 | Will Addison | England | 20-Aug-1992 | 27(10) |
| 31-Aug-2019 | Tadhg Beirne | Ireland | 01-Aug-1992 | 27(29) |
| 31-Aug-2019 | Jack Conan | Ireland | 29-Jul-1992 | 27(32) |
| 31-Aug-2019 | Niall Scannell | Ireland | 08-Apr-1992 | 27(144) |
| 24-Aug-2019 | Iain Henderson | Ireland | 21-Feb-1992 | 27(184) |
| 31-Aug-2019 | Kieran Marmion | Ireland | 11-Feb-1992 | 27(201) |
| 10-Aug-2019 | Andrew Conway | Ireland | 11-Jul-1991 | 28(30) |
| 10-Aug-2019 | Jordi Murphy | Ireland | 22-Apr-1991 | 28(110) |
| 10-Aug-2019 | Rhys Ruddock | Ireland | 13-Oct-1990 | 28(301) |
| 10-Aug-2019 | Robert Herring | Ireland | 27-Apr-1990 | 29(105) |
| 24-Aug-2019 | Bundee Aki | Ireland | 07-Apr-1990 | 29(139) |
| 24-Aug-2019 | CJ Stander | Ireland | 05-Apr-1990 | 29(141) |
| 10-Aug-2019 | Jack McGrath | Ireland | 11-Oct-1989 | 29(303) |
| 24-Aug-2019 | Peter O'Mahony | Ireland | 17-Sep-1989 | 29(341) |
| 10-Aug-2019 | David Kearney | Ireland | 19-Jun-1989 | 30(52) |
| 24-Aug-2019 | Conor Murray | Ireland | 20-Apr-1989 | 30(126) |
| 31-Aug-2019 | Dave Kilcoyne | Ireland | 14-Dec-1988 | 30(260) |
| 31-Aug-2019 | John Ryan | Ireland | 02-Aug-1988 | 31(28) |
| 24-Aug-2019 | Cian Healy | Ireland | 07-Oct-1987 | 31(321) |
| 07-Sep-2019 | Keith Earls | Ireland | 02-Oct-1987 | 31(341) |
| 10-Aug-2019 | Tommy O'Donnell | Ireland | 21-May-1987 | 32(81) |
| 10-Aug-2019 | Devin Toner | Ireland | 29-Jun-1986 | 33(42) |
| 07-Sep-2019 | Jonathan Sexton | Ireland | 11-Jul-1985 | 34(58) |
| 24-Aug-2019 | Robert Kearney | Ireland | 26-Mar-1983 | 36(151) |
| 24-Aug-2019 | Rory Best | Ireland | 15-Aug-1982 | 37(9) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).