Alex signed for City as an Under-15 and has since progressed to the EDS squad, following signing his first professional contract in July 2020.
An all-action central midfield player, Alex has featured regularly for England at Youth level.
Alex spent the first half of the 2021/22 season on loan in the Scottish Premiership with Ross County before returning to the EDS setup.
The midfielder received his first senior international call-up in March 2023 when he was selected as part of the Australia squad for a two-part friendly series against Ecuador.
While born in Scotland, Robertson spent the majority if his early life down under, and qualifies for selection courtesy of his father, Mark, who also represented the Socceroos at senior level.
Alex has joined Portsmouth on a season-long loan for the 2023/24 season.