"We had to wait on their decision which was to either release or retain him.
"He went away and we left it open. We were working hard with another central defender (Kyle Cameron) but we hadn't quite closed that one out.
"But I think we'll all agree that it was a great addition.
"By the time we'd done the work with Kyle, Mark had a brilliant offer from Barrow.
"One that we absolutely had no chance to compete with economically.
"And, in fairness, Mark only spoke about great things about us and he really enjoyed it.
"But where they (Barrow) were training was 20 minutes away from his house.
"It was good for his family and good for him. It was a two-year deal back in the Football League. It was really something we couldn't compete with.
"For Calvin Miller we wanted to keep him and we made an offer.
"But I'll be honest. We were outbid in a big, big, way by Chesterfield.
"It was something we could see wasn't possible.
"I know that, as much as we want players, we cannot risk the economic future of the club by doing things that are reckless or unstable.
"For me, Calvin was a great player and did a great job for me. But we couldn't keep him because somebody offered far better.
"Therefore we go into the market, we recruit, we develop and we do what we think is best for the club."