ParaguayGanó la Copa de Brasil y el Campeonato Brasileño con Atlético Mineiro, además de la Copa de la Liga Argentina con Boca Juniors. También fue subcampeón de la Copa Libertadores con Boca Juniors en 2023.
Junior Alonso es un defensor central paraguayo que ha desarrollado su carrera en clubes como Cerro Porteño, Lille, Boca Juniors y Atlético Mineiro. Se destacó en el fútbol brasileño, donde fue parte del equipo que ganó la Copa de Brasil y el Campeonato Brasileño. También ha sido internacional con la selección de Paraguay, participando en torneos como la Copa América.
Es un defensor central de gran solidez, con buen juego aéreo y capacidad para anticipar jugadas. Su principal fortaleza es la concentración y la lectura del juego, aunque a veces puede ser superado en velocidad. Se desempeña bien en sistemas defensivos de línea alta y es útil en jugadas de balón parado tanto defensivas como ofensivas.
| Season | Comp | Apps | G | A | YC | RC | Min |
|---|---|---|---|---|---|---|---|
| 25/26 | International Friendlies | 7 | 0 | 0 | 1 | 0 | 491 |
| 23/24 | World Cup qualification South America | 12 | 1 | 1 | 4 | 0 | 1062 |
| 23/24 | Russian Cup | 6 | 0 | 0 | 0 | 0 | 356 |
| 23/24 | Premier Liga | 29 | 0 | 3 | 4 | 0 | 2610 |
| 23/24 | International Friendlies | 2 | 0 | 0 | 1 | 0 | 180 |
| 22/23 | Russian Cup | 7 | 0 | 0 | 3 | 0 | 630 |
| 22/23 | Premier Liga | 12 | 1 | 0 | 0 | 0 | 1080 |
| 22/23 | International Friendlies | 3 | 0 | 0 | 0 | 0 | 258 |
| 21/22 | Premier Liga | 0 | 0 | 0 | 0 | 0 | 0 |
| 21/22 | International Friendlies | 0 | 0 | 0 | 0 | 0 | 0 |
| 2026 | Copa Sudamericana | 4 | 0 | 0 | 1 | 0 | 335 |
| 2026 | Campeonato Mineiro | 5 | 0 | 0 | 0 | 1 | 450 |
| 2026 | Copa do Brasil | 0 | 0 | 0 | 0 | 0 | 0 |
| 2026 | Campeonato Brasileiro Série A | 10 | 0 | 0 | 2 | 0 | 900 |
| 2025 | Copa Sudamericana | 13 | 0 | 0 | 3 | 0 | 1148 |
| 2025 | Campeonato Mineiro | 9 | 0 | 0 | 2 | 0 | 765 |
| 2025 | Copa do Brasil | 8 | 0 | 0 | 2 | 0 | 720 |
| 2025 | Campeonato Brasileiro Série A | 31 | 1 | 1 | 5 | 2 | 2619 |
| 2024 | Copa América | 0 | 0 | 0 | 0 | 0 | 0 |
| 2024 | Copa Libertadores | 7 | 0 | 0 | 0 | 0 | 630 |
| 2024 | Copa do Brasil | 8 | 0 | 0 | 2 | 0 | 715 |
| 2024 | Campeonato Brasileiro Série A | 12 | 1 | 0 | 2 | 0 | 1048 |
| 2022 | Copa Libertadores | 10 | 0 | 1 | 0 | 0 | 840 |
| 2022 | Campeonato Mineiro | 1 | 0 | 0 | 0 | 0 | 6 |
| 2022 | Copa do Brasil | 2 | 0 | 0 | 0 | 0 | 168 |
| 2022 | Campeonato Brasileiro Série A | 31 | 0 | 2 | 4 | 0 | 2599 |
| 2021 | Copa América | 5 | 1 | 0 | 1 | 0 | 450 |
| 2021 | Copa Libertadores | 12 | 0 | 0 | 0 | 0 | 1080 |
| 2021 | Campeonato Mineiro | 9 | 0 | 1 | 2 | 0 | 765 |
| 2021 | Copa do Brasil | 8 | 0 | 0 | 1 | 0 | 720 |
| 2021 | Campeonato Brasileiro Série A | 22 | 1 | 0 | 5 | 0 | 1980 |
| 2020 | Copa Libertadores | 2 | 0 | 0 | 0 | 0 | 114 |
| 2020 | Campeonato Mineiro | 6 | 0 | 0 | 2 | 0 | 540 |
| 2020 | Campeonato Brasileiro Série A | 32 | 1 | 2 | 8 | 0 | 2878 |
| 2020 | Copa Superliga (-19/20) | 1 | 0 | 1 | 0 | 0 | 90 |
| 2019 | Supercopa Argentina | 0 | 0 | 0 | 0 | 0 | 0 |
| 2019 | Copa América | 4 | 0 | 0 | 1 | 0 | 360 |
| 2019 | Copa Libertadores | 2 | 0 | 0 | 0 | 0 | 180 |
| 2019 | Copa Superliga (-19/20) | 5 | 0 | 0 | 2 | 0 | 357 |
| 2019 | Copa Argentina | 2 | 0 | 0 | 2 | 0 | 180 |
| 2016 | Primera División Clausura | 0 | 0 | 0 | 0 | 0 | 0 |
| 2016 | Primera División Apertura | 0 | 0 | 0 | 0 | 0 | 0 |
| 2016 | Copa Sudamericana | 10 | 0 | 1 | 2 | 0 | 900 |
| 2016 | Copa Libertadores | 8 | 1 | 1 | 3 | 0 | 699 |
| 2016 | Copa América Centenario 2016 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2015 | Primera División Paraguay Playoffs | 0 | 0 | 0 | 0 | 0 | 0 |
| 2015 | Primera División Clausura | 0 | 0 | 0 | 0 | 0 | 0 |
| 2015 | Primera División Apertura | 0 | 0 | 0 | 0 | 0 | 0 |
| 2015 | Copa América | 0 | 0 | 0 | 0 | 0 | 0 |
| 2015 | Copa Libertadores | 0 | 0 | 0 | 0 | 0 | 0 |
| 2014 | Copa Sudamericana | 4 | 0 | 0 | 1 | 0 | 298 |
| 2014 | Copa Libertadores | 8 | 0 | 0 | 2 | 0 | 712 |
| 2013 | Copa Sudamericana | 2 | 0 | 0 | 0 | 0 | 180 |
| 2013 | Copa Libertadores | 0 | 0 | 0 | 0 | 0 | 0 |
| 2013 | U-20 South American Championship | 2 | 1 | 0 | 0 | 0 | 119 |
| 2013 | U20 World Cup | 4 | 0 | 0 | 1 | 0 | 390 |
| 20/21 | World Cup qualification South America | 14 | 0 | 0 | 6 | 0 | 1166 |
| 19/20 | International Friendlies | 3 | 0 | 0 | 2 | 0 | 270 |
| 19/20 | Professional Football League (- 23/24) | 14 | 0 | 1 | 2 | 0 | 1149 |
| 18/19 | International Friendlies | 3 | 0 | 0 | 1 | 0 | 270 |
| 18/19 | Ligue 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 18/19 | LaLiga | 9 | 0 | 0 | 2 | 0 | 534 |
| 18/19 | Copa del Rey | 2 | 0 | 0 | 0 | 0 | 180 |
| 18/19 | Professional Football League (- 23/24) | 7 | 0 | 0 | 1 | 0 | 630 |
| 17/18 | International Friendlies | 2 | 0 | 0 | 1 | 0 | 180 |
| 17/18 | Coupe de la Ligue | 2 | 1 | 0 | 1 | 0 | 180 |
| 17/18 | Coupe de France | 2 | 0 | 0 | 0 | 0 | 180 |
| 17/18 | Ligue 1 | 34 | 2 | 0 | 3 | 0 | 2779 |
| 16/17 | International Friendlies | 2 | 0 | 0 | 0 | 0 | 180 |
| 16/17 | Coupe de France | 2 | 0 | 0 | 0 | 0 | 180 |
| 16/17 | Ligue 1 | 12 | 0 | 1 | 1 | 0 | 956 |
| 15/16 | World Cup qualification South America | 8 | 1 | 1 | 3 | 0 | 705 |
| 15/16 | International Friendlies | 0 | 0 | 0 | 0 | 0 | 0 |
| 14/15 | International Friendlies | 2 | 0 | 0 | 0 | 0 | 180 |
| 13/14 | International Friendlies | 3 | 0 | 1 | 0 | 0 | 250 |
| 12/13 | International Friendlies | 2 | 0 | 0 | 1 | 0 | 180 |
| 11/12 | World Cup qualification South America | 1 | 0 | 0 | 0 | 0 | 90 |