Pickering Town manager Steve Roberts announced Turnbull's commitment to the club for the 2020-21 campaign in the NPL North West Division this morning, along with midfielder Iwan Heeley.
Former Boro coach Roberts said: "It is great news that Matty has committed to us for the coming season.
"He is one of the players who i really wanted to retain, not only is Matty a very strong defender, but he can also be a threat from set pieces in the attacking third .
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"He has the club at heart and I want people like him at the club to help move the club forward in the next few seasons."