| MD | Players | Club | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 04-May-2019 |  Michael Lowry | Ulster | Ireland | 20-Aug-1998 | 20(257) |
| 17-May-2019 |  Matt Fagerson | Glasgow Warriors | Scotland | 16-Jul-1998 | 20(305) |
| 04-May-2019 | Marco Riccioni | Benetton Treviso | Italy | 19-Oct-1997 | 21(197) |
| 04-May-2019 | Marco Zanon | Benetton Treviso | Italy | 03-Oct-1997 | 21(213) |
| 04-May-2019 | Robert Baloucoune | Ulster | Ireland | 19-Aug-1997 | 21(258) |
| 18-May-2019 |  Jordan Larmour | Leinster | Ireland | 10-Jun-1997 | 21(342) |
| 04-May-2019 | Robert Lyttle | Ulster | Ireland | 28-Jan-1997 | 22(96) |
| 17-May-2019 | Scott Cummings | Glasgow Warriors | Scotland | 03-Dec-1996 | 22(165) |
| 17-May-2019 | Adam Hastings | Glasgow Warriors | Scotland | 05-Oct-1996 | 22(224) |
| 18-May-2019 | James Ryan | Leinster | Ireland | 24-Jul-1996 | 22(298) |
| 17-May-2019 | Jacob Stockdale | Ulster | Ireland | 03-Apr-1996 | 23(43) |
| 17-May-2019 | Zander Fagerson | Glasgow Warriors | Scotland | 19-Jan-1996 | 23(118) |
| 04-May-2019 | Eric O'Sullivan | Ulster | Ireland | 30-Nov-1995 | 23(155) |
| 04-May-2019 | Kieran Treadwell | Ulster | England | 16-Nov-1995 | 23(169) |
| 04-May-2019 | Stephen Fitzgerald | Connacht | Ireland | 13-Nov-1995 | 23(172) |
| 18-May-2019 |  Joey Carbery | Munster | Ireland | 01-Nov-1995 | 23(198) |
| 04-May-2019 | Marco Lazzaroni | Benetton Treviso | Italy | 18-Aug-1995 | 23(259) |
| 18-May-2019 | Ross Byrne | Leinster | Ireland | 08-Apr-1995 | 24(40) |
| 18-May-2019 | Gary Ringrose | Leinster | Ireland | 26-Jan-1995 | 24(112) |
| 04-May-2019 | Nick Timoney | Ulster | Ireland | 08-Jan-1995 | 24(116) |
| 04-May-2019 | Monty Ioane | Benetton Treviso | Australia | 30-Oct-1994 | 24(186) |
| 04-May-2019 | Ross Kane | Ulster | Ireland | 14-Oct-1994 | 24(202) |
| 04-May-2019 | Federico Ruzza | Benetton Treviso | Italy | 04-Aug-1994 | 24(273) |
| 04-May-2019 | Sebastian Negri | Benetton Treviso | Italy | 30-Jun-1994 | 24(308) |
| 04-May-2019 | Michael Haley | Munster | Ireland | 28-Jun-1994 | 24(310) |
| 04-May-2019 | Billy Burns | Ulster | Ireland | 13-Jun-1994 | 24(325) |
| 17-May-2019 | Jonny Gray | Glasgow Warriors | Scotland | 14-Mar-1994 | 25(64) |
| 17-May-2019 | Kyle Steyn | Glasgow Warriors | Scotland | 29-Jan-1994 | 25(108) |
| 04-May-2019 | Rory Scannell | Munster | Ireland | 22-Dec-1993 | 25(133) |
| 04-May-2019 | Toa Halafihi | Benetton Treviso | Italy | 27-Nov-1993 | 25(158) |
| 04-May-2019 | Ultan Dilane | Connacht | Ireland | 09-Nov-1993 | 25(176) |
| 04-May-2019 | Gavin Thornbury | Connacht | Ireland | 19-Oct-1993 | 25(197) |
| 04-May-2019 | Tom Farrell | Connacht | Ireland | 01-Oct-1993 | 25(215) |
| 04-May-2019 | Jean Kleyn | Munster | South Africa | 26-Aug-1993 | 25(251) |
| 17-May-2019 | Jamie Bhatti | Glasgow Warriors | Scotland | 08-Sep-1993 | 25(251) |
| 17-May-2019 | Sam Johnson | Glasgow Warriors | Scotland | 19-Jun-1993 | 25(332) |
| 18-May-2019 | Robbie Henshaw | Leinster | Ireland | 12-Jun-1993 | 25(340) |
| 04-May-2019 | Darren Sweetman | Munster | Ireland | 05-May-1993 | 25(364) |
| 17-May-2019 | Ali Price | Glasgow Warriors | Scotland | 12-May-1993 | 26(5) |
| 04-May-2019 | Tommaso Allan | Benetton Treviso | Italy | 26-Apr-1993 | 26(8) |
| 18-May-2019 | Josh van der Flier | Leinster | Ireland | 25-Apr-1993 | 26(23) |
| 04-May-2019 | Chris Farrell | Munster | Ireland | 16-Mar-1993 | 26(49) |
| 18-May-2019 | Luke McGrath | Leinster | Ireland | 03-Feb-1993 | 26(104) |
| 18-May-2019 | Tadhg Furlong | Leinster | Ireland | 14-Nov-1992 | 26(185) |
| 04-May-2019 | Jack Carty | Connacht | Ireland | 31-Aug-1992 | 26(246) |
| 04-May-2019 | Stuart McCloskey | Ulster | Ireland | 06-Aug-1992 | 26(271) |
| 04-May-2019 | Tadhg Beirne | Munster | Ireland | 01-Aug-1992 | 26(276) |
| 18-May-2019 | Jack Conan | Leinster | Ireland | 29-Jul-1992 | 26(293) |
| 18-May-2019 | James Lowe | Leinster | Wales | 08-Jul-1992 | 26(314) |
| 17-May-2019 | Stuart Hogg | Glasgow Warriors | Scotland | 24-Jun-1992 | 26(327) |
MD = Match date,
DOB = Date of birth,
A(D) = Age(days).