|Date of birth||4 May 1996|
|Place of birth||Tours, France|
|Height||1.86 m (6 ft 1 in)|
|2004–2005||AS Angoulême-Charente 92|
|2015–2016||→ Zulte Waregem (loan)||33||(2)|
* Senior club appearances and goals counted for the domestic league only and correct as of 07:12, 17 March 2019 (UTC)|
‡ National team caps and goals correct as of 21 March 2019
Born in Tours, Diallo joined the youth academy of AS Monaco FC at the age of 15. On 28 March 2014, he signed his first professional contract with the club. Vice-president of the club, Vadim Vasilyev commented that Diallo "fits perfectly into our sports project. He has a lot of talent and we hope that he will continue to progress alongside the great players of AS Monaco". On 14 December, he made his first team debut, coming on as a substitute for Bernardo Silva in the extra time of a 1–0 league victory against Olympique Marseille.
In June 2015, Diallo was loaned out to Belgian club Zulte Waregem for the 2015–16 season. During his stint at the club, he was deployed at an attacking role, scoring three goals in 33 league matches. In December 2016, media reports emerged that Spanish club Real Betis was interested in signing him. Nevertheless, he made five league appearances during the 2016–17 season, with his side winning the league.
On 14 July 2017, Diallo moved to German Bundesliga club 1. FSV Mainz 05 and signed a five-year contract. On 9 September, he scored his first goal for the club in a 3–1 league victory against Bayer 04 Leverkusen. In December, Mirror.co.uk reported that English club Arsenal was scouting him in a bid to replace the retiring Per Mertesacker. During the season, he was deployed at both back three and back four; and had an 80%-successful pass rate. He started in 27 league matches during the season.
On 26 June 2018, Diallo joined Borussia Dortmund on a five-year deal for a fee of € 28 million. In an interview, he said that Ousmane Dembele advised him to join the club. On 15 September, he scored his first goal for the club in a 3–1 league victory against Eintracht Frankfurt.
- As of match played 16 March 2019
|Zulte Waregem (loan)||2015–16||Jupiler Pro League||33||3||2||0||—||—||35||3|
Style of play
Diallo plays as a central defender. Rouven Schröder (sporting director of 1. FSV Mainz) has said that Diallo is "strong in the air and shrewd in the challenge". Michael Zorc, the sporting director of Borussia Dortmund described Diallo as "a modern, strong central defender who is very intelligent. He can play a wider defensive role too or even be deployed in a defensive midfield role".
- "Profis: Abdou Diallo" [Pros: Abdou Diallo] (in German). Borussia Dortmund. Archived from the original on 7 January 2019. Retrieved 7 January 2019.
- "Abdou Diallo: Mainz's natural-born defensive leader with an eye for goal". Bundesliga. 27 May 2018. Retrieved 12 September 2018.
- Franck Orocoti (29 March 2014). "Monaco: Abdou Diallo signe pro" [Monaco: Abdou Diallo signs pro] (in French). Africa Top Sports. Retrieved 12 September 2018.
- "MATCH REPORT: AS Monaco 1-0 AS Monaco". AS Monaco FC. 14 December 2014. Retrieved 12 September 2018.
- "Abdou Diallo joins Zulte Waregem". Get French Football News. Retrieved 29 July 2015.
- Miguel A Moran (31 December 2016). "Abdou Diallo, central zurdo del Mónaco, otra opción para la defensa del Betis" [Abdou Diallo, left-back at Monaco, another option for Betis defense] (in Spanish). Marca. Retrieved 12 September 2018.
- "Mainz sign France Under-21 captain Abdou Diallo". Bundesliga. 14 July 2017. Retrieved 12 September 2018.
- "Mainz off the mark with 3-1 victory over winless Leverkusen". Bundesliga. 9 September 2017. Retrieved 12 September 2018.
- Liam Prenderville (21 December 2017). "Arsenal scouting Abdou Diallo with Mainz defender high on Arsene Wenger's January wishlist". Mirror. Retrieved 12 September 2018.
- "Wechsel perfekt: Diallo der zweitteuerste BVB-Neuzugang" (in German). 26 June 2018. Retrieved 26 June 2018.
- "Borussia Dortmund sign Abdou Diallo, France under-21 defender, from Mainz". ESPN. 26 June 2018. Retrieved 16 September 2018.
- "Wolf, Diallo, Delaney, Hakimi and Hitz: meet the Borussia Dortmund new boys". Bundesliga. 4 August 2018. Retrieved 16 September 2018.
- "Dortmund overpower Frankfurt 3-1 in German Bundesliga - Xinhua | English.news.cn". www.xinhuanet.com. 15 September 2018. Retrieved 16 September 2018.
- "ABDOU DIALLO, LE RETOUR DU "PRINCE" !". 30 June 2016.
- "Monaco prête le jeune Ibrahima Diallo à Brest". 13 August 2018.
- "A.Diallo". soccerway.com. Soccerway. Retrieved 12 August 2017.
- "Abdou Diallo quits Mainz 05 for Borussia Dortmund". The New Indian Express. 26 June 2018. Retrieved 12 September 2018.