Harley’s initial loan deal expired last weekend, but the new deal will keep him at Don Valley until January 2.
“It was something that I wanted to do after speaking with the manager last week, and fortunately the two clubs have agreed to it,” Harley said.
Manager Andy Scott added: “We have extended the loan until January, which I am delighted about. He goes about his business very well and he is a terrific pro. He has fit in seamlessly really.”