John O’Sullivan opted for a fresh challenge at Accrington Stanley, leaving Liam Gibson as the only other player whose future is unknown.
“I’m thrilled to have signed again,” Mellor told the club website.
“I spoke to the manager and I was really impressed with what he had to say and I can’t wait to get back.
“It was a massive achievement for the club to reach League One but one we are looking forward to.
“It will be a challenge but we upset the odds massively last year and I can’t see any reason why we can't do the same again this year.'”
Robinson added: “We are delighted to have Kelvin on board,” he said.
“He is an experienced professional and a good athlete who had a really good season last year with us.
“It is great to have another player from last year’s squad sign up again for us to maintain the feelgood factor at the club.”
Thanks for reading. If you value what we do and are able to support us, a digital subscription is just £1 per month for the first two months. Try us today by clicking here