Borna Sosa (Croatian pronunciation: [bôːrna sǒːsa]; born 21 January 1998) is a Croatian professional footballer who plays as a left-back or a left wing-back for Bundesliga club VfB Stuttgart and the Croatia national team.
Sosa was born in the Prečko neighbourhood of Zagreb to Herzegovinian Croat parents from Gradac near Posušje. He is a youth prospect of Dinamo Zagreb. He was given his Prva HNL debut for Dinamo by coach Zoran Mamić on 7 March 2015 in a 2–0 home win over Zagreb, starting and playing full 90 minutes. On 10 May 2016, he played full 90 minutes in the Croatian Cup Final as Dinamo defeated Slaven Belupo 2–1. He made his European debut on 12 July 2016, when coach Zlatko Kranjčar substituted him for Alexandru Mățel in the 66th minute of the 2–1 victory over Vardar in Skopje in the Champions League second qualifying round. Over the course of four seasons at Dinamo, Sosa made 41 appearances and six assists for his hometown club.
On 14 May 2018, Borna Sosa signed a five-year-contract with VfB Stuttgart, enabling him to transfer to Stuttgart on 1 July. He made his debut for Stuttgart on 26 August, after being substituted on for Emiliano Insúa in the 84th minute of the 1–0 loss to Mainz. However, due to frequent injuries, Sosa’s minutes were significantly reduced in his first season with Stuttgart, which saw the club relegated to the 2. Bundesliga. The injuries continued during his second season as well, resulting in Sosa making only 24 appearances for Stuttgart in his first two seasons. On 16 December 2019, he scored his debut goal for Stuttgart in a 1–1 draw with Darmstadt. However, the 2020–21 season was Sosa’s breakthrough season, as he found form and consistency in Pellegrino Matarazzo‘s 3–4–2–1 formation. His performances in the Bundesliga earned him praise and comparisons to David Beckham, whom he named his football role model alongside David Alaba. On 27 November 2020, he extended his contract until 2025. He finished the season with nine assists on his account.
At the beginning of the 2021–22 season, on 7 August, Sosa captained Stuttgart for the first time in a DFB-Pokal match against Dynamo Berlin, scoring and assisting in the 6–0 victory. Seven days later, on the first matchday of Bundesliga, Sosa provided Marc-Oliver Kempf and Hamadi Al Ghaddioui with a hat-trick of assists as Stuttgart defeated Greuther Fürth 5–1.