Miller, 30, joins the club after a brief stint with National League side AFC Fylde. He has also previously featured for Dundalk, Newport County, Lincoln City and Carlisle United.
Cole, 27, spent a short period with FC United of Manchester last season. The midfielder began his career at Manchester United, and has also previously played for Tranmere Rovers, Shrewsbury Town and Fulham, as well as representing England at under-19s and under-20s.
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