The club shared on social media: "Our fantastic stopper Theo Richardson is officially leaving the Owls today.
"He departs with everyone's very best wishes for his future career. Good luck Theo - and thanks for the memories!"
Richardson added: "Big thank you to everyone associated with Cleethorpes Town for the past two years. Loved my time there and it's been a pleasure to work with all the staff and the players.
"Made me and my family feel welcome from day one and I'll forever be thankful for that! Once an Owl, always an Owl!"
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