| Diego Caballo | |
| Full Name: | Diego Caballo Alonso |
| Birth Date: | 17 February 1994 |
| Birth Place: | Salamanca, Spain |
| Height: | 1.71 m |
| Position: | Left-back |
| Currentclub: | AaB |
| Clubnumber: | 15 |
| Youthyears1: | 1999–2003 |
| Youthclubs1: | Capuchinos |
| Youthyears2: | 2003–2009 |
| Youthclubs2: | Salamanca |
| Youthyears3: | 2009–2013 |
| Youthclubs3: | Real Madrid |
| Years1: | 2013–2015 |
| Clubs1: | Real Madrid C |
| Caps1: | 59 |
| Goals1: | 5 |
| Years2: | 2014–2015 |
| Clubs2: | Real Madrid B |
| Caps2: | 6 |
| Goals2: | 0 |
| Years3: | 2015–2017 |
| Clubs3: | Valencia B |
| Caps3: | 29 |
| Goals3: | 1 |
| Years4: | 2017–2018 |
| Clubs4: | Deportivo B |
| Caps4: | 28 |
| Goals4: | 2 |
| Years5: | 2018–2019 |
| Clubs5: | Deportivo La Coruña |
| Caps5: | 27 |
| Goals5: | 0 |
| Years6: | 2019–2020 |
| Clubs6: | Extremadura |
| Caps6: | 14 |
| Goals6: | 1 |
| Years7: | 2020–2021 |
| Clubs7: | Albacete |
| Caps7: | 31 |
| Goals7: | 0 |
| Years8: | 2021–2022 |
| Clubs8: | CR Sabadell FC |
| Caps8: | 30 |
| Goals8: | 1 |
| Years9: | 2022–2023 |
| Clubs9: | Sydney FC |
| Caps9: | 25 |
| Goals9: | 2 |
| Years10: | 2023– |
| Clubs10: | AaB |
| Caps10: | 26 |
| Goals10: | 0 |
| Nationalyears1: | 2011 |
| Nationalteam1: | Spain U17 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Club-Update: | 3 December 2024 |
Diego Caballo Alonso (born 17 February 1994) is a Spanish professional footballer who plays for AaB as a left-back for Danish Superliga club AaB.
Caballo was born in Salamanca, Castile and León, and joined Real Madrid's youth setup in 2009, from UD Salamanca.[1] He made his senior debut with the C-team on 24 August 2013, starting in a 1–0 Segunda División B away win against Atlético Madrid B.
Caballo first appeared with the reserves on 24 August 2014, playing the full 90 minutes in a 1–2 loss at the same opponent also for the third division championship.[2] He scored his first senior goal with the C's on 19 October, netting the opener in a 2–0 Tercera División home defeat of CD Móstoles URJC.
On 7 July 2015, free agent Caballo signed for Valencia CF, being assigned to the B-team also in the third tier.[3] He moved to another reserve team on 2 July 2017, after agreeing to a contract with Deportivo Fabril in the same division.[4]
On 5 July 2018, Caballo renewed his contract with Dépor for two seasons.[5] On 13 August, he was definitely promoted to the main squad in Segunda División.[6]
Caballo made his professional debut on 17 August 2018, starting in a 1–1 away draw against Albacete Balompié.[7] On 2 September of the following year, he terminated his contract with Dépor,[8] and signed a one-year deal with fellow second division side Extremadura UD the following day.[9]
On 22 January 2020, Caballo cut ties with Extremadura and agreed to a two-and-a-half-year contract with Albacete Balompié, still in the second division.[10]
On 13 July 2022, Caballo signed for Australian A-League club Sydney FC.[11] After a slow start to his time at Sydney, Caballo would score a free kick to open his scoring account for the club in a 2-3 defeat to league leaders Melbourne City.[12] His second goal was scored in a 3-3 draw against Western United in Round 22.
On 5 July 2023, Caballo signed for newly relegated Danish 1st Division side AaB for an undisclosed fee from Sydney FC.[13] [14]