Born in London, Alexander signed for Millwall at the age of seven.[3] He spent twelve years in the Academy before making his first team debut in the last game of the season on 5 May 2019, coming on a late substitute in the 1–0 defeat to Wigan Athletic. He had previously been on the bench earlier in the season for an FA Cup tie with Everton.[3]
Bromley
In August 2021, Alexander signed for National League club Bromley following a successful trial period.[4]
He made eleven appearances for the club, scoring four goals before being recalled and joining Slough Town on 23 March;[6] the club he had scored a hat-trick against the previous month.[7]