The 20-year-old right-back impressed last season after arriving at the club on loan in January, making eight appearances.
John Pemberton is delighted to have been able to bring Cropper back to the Technique Stadium.
He said: "Jordan has great potential and he did really well for us last season so I'm really looking forward to working with him again.
"Jordan had other offers but he was desperate to come back here and Sean Dyche was only too pleased to help us out."
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