The former Salford City man arrives at the club ahead of Saturday's season-opening fixture at home to Prescot Cables in the Pitching In NPL West Division.
He made 34 appearances for Widnes last season, the second-most of any player in Dave Dempsey’s squad.
Adetiloye has also enjoyed spells at Padiham and Ramsbottom United.
Meanwhile, the Greens have also confirmed that both Mackenzie O’Neill and Fenton Green have signed contracts with the club.
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