| MD | Players | Clubs | Nationality | DOB | A(D) |
|---|---|---|---|---|---|
| 13-Sep-2020 |  Yunus Musah | Valencia | England | 29-Nov-2002 | 17(289) |
| 13-Sep-2020 |  Ander Barrenetxea | Real Sociedad | Spain | 27-Dec-2001 | 18(261) |
| 20-Sep-2020 |  Sergio Arribas | Real Madrid | Spain | 30-Sep-2001 | 18(356) |
| 13-Sep-2020 |  Takefusa Kubo | Villarreal | Japan | 04-Jun-2001 | 19(101) |
| 13-Sep-2020 | Kangin Lee | Valencia | South Korea | 19-Feb-2001 | 19(206) |
| 20-Sep-2020 |  Borja Sainz | CD Alaves | Spain | 01-Feb-2001 | 19(231) |
| 20-Sep-2020 | Rodrygo | Real Madrid | Brazil | 09-Jan-2001 | 19(254) |
| 12-Sep-2020 |  Unai Vencedor Paris | Athletic Bilbao | Spain | 15-Nov-2000 | 19(301) |
| 13-Sep-2020 | Fernando Nino | Villarreal | Spain | 24-Oct-2000 | 19(324) |
| 20-Sep-2020 |  Sergio Gomez | Huesca SD | Spain | 04-Sep-2000 | 20(16) |
| 13-Sep-2020 |  Diego Lainez | Real Betis | Mexico | 09-Jul-2000 | 20(66) |
| 20-Sep-2020 | Vinicius Junior | Real Madrid | Brazil | 12-Jul-2000 | 20(70) |
| 20-Sep-2020 | Marvin Park | Real Madrid | Spain | 03-Jul-2000 | 20(79) |
| 20-Sep-2020 | Abdallahi Mahmoud | CD Alaves | Mauritania | 04-May-2000 | 20(139) |
| 12-Sep-2020 | Oihan Sancet | Athletic Bilbao | Spain | 25-Apr-2000 | 20(140) |
| 13-Sep-2020 | Roberto Lopez | Real Sociedad | Spain | 24-Apr-2000 | 20(142) |
| 12-Sep-2020 |  Miguel Baeza | Celta Vigo | Spain | 27-Mar-2000 | 20(169) |
| 13-Sep-2020 | Alexander Isak | Real Sociedad | Sweden | 21-Sep-1999 | 20(358) |
| 13-Sep-2020 | Samuel Chukwueze | Villarreal | Nigeria | 22-May-1999 | 21(115) |
| 19-Sep-2020 |  Miguel Atienza | Eibar | Spain | 27-May-1999 | 21(116) |
| 19-Sep-2020 |  Cucho Hernandez | Getafe | Colombia | 22-Apr-1999 | 21(151) |
| 13-Sep-2020 | Joaquin Munoz | Huesca SD | Spain | 10-Mar-1999 | 21(188) |
| 19-Sep-2020 | Thierry Correia | Valencia | Portugal | 09-Mar-1999 | 21(195) |
| 19-Sep-2020 | Fran Beltran | Celta Vigo | Spain | 03-Feb-1999 | 21(229) |
| 13-Sep-2020 | Emerson | Real Betis | Brazil | 14-Jan-1999 | 21(243) |
| 13-Sep-2020 | Vicente Esquerdo | Valencia | Spain | 02-Jan-1999 | 21(255) |
| 20-Sep-2020 | Martin Odegaard | Real Madrid | Norway | 17-Dec-1998 | 21(278) |
| 12-Sep-2020 | Jon Morcillo | Athletic Bilbao | Spain | 15-Sep-1998 | 21(363) |
| 19-Sep-2020 | Marc Cucurella | Getafe | Spain | 22-Jul-1998 | 22(60) |
| 20-Sep-2020 | Federico Valverde | Real Madrid | Uruguay | 22-Jul-1998 | 22(61) |
| 12-Sep-2020 |  Jon Moncayola | Osasuna | Spain | 13-May-1998 | 22(123) |
| 13-Sep-2020 | Uros Racic | Valencia | Serbia | 17-Mar-1998 | 22(181) |
| 20-Sep-2020 | Dani Escriche | Huesca SD | Spain | 24-Mar-1998 | 22(181) |
| 19-Sep-2020 | Pervis Estupinan | Villarreal | Ecuador | 21-Jan-1998 | 22(242) |
| 12-Sep-2020 |  Yangel Herrera | Granada CF | Venezuela | 07-Jan-1998 | 22(249) |
| 20-Sep-2020 | Paul Akouokou | Real Betis | Finland | 20-Dec-1997 | 22(275) |
| 19-Sep-2020 | Mathias Olivera | Getafe | Uruguay | 31-Oct-1997 | 22(324) |
| 12-Sep-2020 | Asier Villalibre | Athletic Bilbao | Spain | 30-Sep-1997 | 22(348) |
| 13-Sep-2020 | Aihen Munoz | Real Sociedad | Spain | 16-Aug-1997 | 23(28) |
| 12-Sep-2020 | Emre Mor | Celta Vigo | Turkey | 24-Jul-1997 | 23(50) |
| 13-Sep-2020 | Pablo Maffeo | Huesca SD | Spain | 12-Jul-1997 | 23(63) |
| 19-Sep-2020 | Ivan Villar | Celta Vigo | Spain | 09-Jul-1997 | 23(72) |
| 20-Sep-2020 | Ander Guevara | Real Sociedad | Spain | 07-Jul-1997 | 23(75) |
| 13-Sep-2020 | Rafa Mir | Huesca SD | Spain | 18-Jun-1997 | 23(87) |
| 12-Sep-2020 | Unai Simon | Athletic Bilbao | Spain | 11-Jun-1997 | 23(93) |
| 12-Sep-2020 | Sergio Gonzalez | Cadiz FC | Spain | 14-May-1997 | 23(121) |
| 19-Sep-2020 | Enes Unal | Getafe | Turkey | 10-May-1997 | 23(132) |
| 13-Sep-2020 | Mikel Oyarzabal | Real Sociedad | Spain | 21-Apr-1997 | 23(145) |
| 20-Sep-2020 |  Samuel Perez | Real Valladolid | Spain | 26-Apr-1997 | 23(147) |
| 12-Sep-2020 | Kike Barja | Osasuna | Spain | 01-Apr-1997 | 23(164) |
MD = Match date,
DOB = Date Of Birth,
A(D) = Age(Days).