Burnley-born defender Sykes started out in the Clarets Academy but was released aged 13.
He had debated giving up football but was persuaded by his mum to go for a trial at Accrington and was taken on.
The tall centre half signed a two-year professional deal in May 2016.
He made his senior debut for the club in August 2016 starting in the 3-0 defeat to Crewe in the EFL trophy group stage.
Home shirt sponsored by John Ross