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The 34-year-old joined the club from National League North side Bradford Park Avenue following his release in October 2017.
Knowles left Avenue after three spells at the West Yorkshire side, sitting in fifth place in the all-time club appearances chart after making over 200 appearances. The popular centre-back played a key role in keeping Mark Bower’s side up last season with 26 appearances after re-joining in October 2016.
Knowles has also enjoyed a two-year spell at FC United of Manchester from 2014 to 2016 and spent time playing for FC Halifax Town and Farsley Celtic.
The defender made his debut in the Evo-Stik North game away at Prescot Cables.