| MD | Players | Nationality | DOB | A(D) |
|---|---|---|---|---|
| 22-Sep-2019 | Jordan Larmour | Ireland | 10-Jun-1997 | 22(104) |
| 22-Sep-2019 | James Ryan | Ireland | 24-Jul-1996 | 23(59) |
| 22-Sep-2019 | Jacob Stockdale | Ireland | 03-Apr-1996 | 23(171) |
| 22-Sep-2019 | Gary Ringrose | Ireland | 26-Jan-1995 | 24(239) |
| 03-Oct-2019 | Jean Kleyn | South Africa | 26-Aug-1993 | 26(38) |
| 12-Oct-2019 | Robbie Henshaw | Ireland | 12-Jun-1993 | 26(122) |
| 22-Sep-2019 | Josh van der Flier | Ireland | 25-Apr-1993 | 26(150) |
| 28-Sep-2019 | Chris Farrell | Ireland | 16-Mar-1993 | 26(196) |
| 03-Oct-2019 | Luke McGrath | Ireland | 03-Feb-1993 | 26(242) |
| 22-Sep-2019 | Tadhg Furlong | Ireland | 14-Nov-1992 | 26(312) |
| 28-Sep-2019 | Jack Carty | Ireland | 31-Aug-1992 | 27(27) |
| 03-Oct-2019 | Tadhg Beirne | Ireland | 01-Aug-1992 | 27(62) |
| 03-Oct-2019 | Niall Scannell | Ireland | 08-Apr-1992 | 27(177) |
| 22-Sep-2019 | Iain Henderson | Ireland | 21-Feb-1992 | 27(213) |
| 22-Sep-2019 | Andrew Conway | Ireland | 11-Jul-1991 | 28(73) |
| 03-Oct-2019 | Jordi Murphy | Ireland | 22-Apr-1991 | 28(164) |
| 03-Oct-2019 | Rhys Ruddock | Ireland | 13-Oct-1990 | 28(355) |
| 22-Sep-2019 | Bundee Aki | Ireland | 07-Apr-1990 | 29(168) |
| 22-Sep-2019 | CJ Stander | Ireland | 05-Apr-1990 | 29(170) |
| 22-Sep-2019 | Peter O'Mahony | Ireland | 17-Sep-1989 | 30(5) |
| 22-Sep-2019 | Conor Murray | Ireland | 20-Apr-1989 | 30(155) |
| 03-Oct-2019 | Dave Kilcoyne | Ireland | 14-Dec-1988 | 30(293) |
| 03-Oct-2019 | John Ryan | Ireland | 02-Aug-1988 | 31(62) |
| 22-Sep-2019 | Cian Healy | Ireland | 07-Oct-1987 | 31(350) |
| 28-Sep-2019 | Keith Earls | Ireland | 02-Oct-1987 | 31(361) |
| 22-Sep-2019 | Jonathan Sexton | Ireland | 11-Jul-1985 | 34(73) |
| 28-Sep-2019 | Robert Kearney | Ireland | 26-Mar-1983 | 36(186) |
| 22-Sep-2019 | Rory Best | Ireland | 15-Aug-1982 | 37(38) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).