Kevin Mac Allister

Early career

The Mac Allister brothers started their career with Argentinos Juniors. He made his first team debut for Argentinos on 27 February 2016 in a 4–1 defeat against Estudiantes. Mac Allister made more appearances followed in his debut season of 2016. The was relegated in that season and he subsequently made sixteen appearances in Primera B Nacional as Argentinos won the title. Mac Allister scored his first senior goal in March 2018 against Gimnasia y Esgrima. Mac Allister joined Boca Juniors on loan in January 2019.

Union SG

On 12 July 2023, Belgian club Union SG announced the signing of Mac Allister on a three-year contract, with an option of a further year. Later that year, on 5 October, he shared the pitch with his young brother Alexis after the latter came on as a substitute in a Europa League group stage match against Liverpool. On 25 May 2025, Mac Allister was a member of the Union SG squad that achieved the 2024–25 Belgian Pro League, ending a 90-year title drought. Two months later, on 5 July, he extended his contract with the club until 2027.

Mac Allister received a call-up to the Argentina U20 squad for the 2017 South American Youth Football Championship in Ecuador. However, he missed the tournament due to injury. In November 2025, Mac Allister received his first call-up to the senior Argentina national team for a friendly match against Angola. He debuted in said tournament against the same opponent on 14 November.

Club

As of match played 12 September 2026

International

As of match played 14 November 2025

Mac Allister is of predominantly Irish descent, with some Scottish ancestry as well. His Irish ancestry can be traced back to Donabate, County Dublin, while his Scottish ancestry can be traced back to Tarbert, Kintyre. Mac Allister's Scottish forefather Charles McAllister, a Protestant who converted to Catholicism, had temporarily moved to Donabate from the Scottish town of Tarbert in the 18th century. Charles' descendant Joseph McAllister emigrated from Donabate in 1865 to acquire farmland in Argentina, where the family name was changed to Mac Allister. Additionally, Mac Allister has Italian ancestry through his maternal grandmother, whose roots trace back to Belmonte del Sannio, Isernia. Mac Allister has two brothers, Alexis who plays as a midfielder for club Liverpool and the Argentina national team with whom he won the 2022 FIFA World Cup and Francis who plays as a midfielder for Deportes La Serena of the Liga de Primera. They are the sons of Carlos Mac Allister and nephews of Patricio Mac Allister. His cousin, Luciano Guaycochea is also a professional footballer. As of 2024, Mac Allister was engaged to marry Tatiana Batista, daughter of former footballer and coach Fernando Batista. The couple married on 14 June 2025, and announced in the same month they were expecting their first child together. Mac Allister is named after the main protagonist of the American Christmas family comedy film Home Alone, a fact that he did not find out until he was eighteen years old.