Alex was born in Mokomre, Sierra Leone, in July 1999 and started his career in the Netherlands with DRL before joining Feyenoord at youth level.

He played for the Dutch club from U18 to U21 level before joining SC Cambuur on a permanent basis, where he went on to captain the side.

Alex was a promotion winner with Cambuur and racked up over 100 appearances between 2018 and 2023.

He became Boro's 12th and final signing of the summer transfer window, penning a four-year deal on Teesside.

Alex is a five-time capped international for Sierra Leone.