The 20-year-old central defender signed a two-year deal with the Whites after impressing during the last pre-season.
Born and raised in Stratford, Adebowale came through the ranks at West Ham United before joining then-League One side Sheffield United on a two-year scholarship in the summer of 2013.
While he was with the Blades, 6`5” Adebowale, also spent time on loan with Evo-Stik League South sides Goole AFC and Sheffield FC.
After being released by United, Adebowale had spells with Hayes & Yeading United and Bishop`s Stortford.