Date of birth
A look at the Argentinian midfielder's career.
Alexis Mac Allister signed a four-and-a-half year contract with the club from Argentinos Juniors in January 2019.
Mac Allister came through the Juniors academy and made his senior debut in a goalless draw with Central Cordoba in October 2016.
The midfielder won promotion to the top flight in Argentina later that season, with the club going up as champions.
In total, the midfielder scored eight goals in 58 appearances for Juniors before signing for the Seagulls.
Mac Allister was sent straight back to the South American club on a loan deal until the end of the season, following his decision to join Chris Hughton's side.