However, Coleman revealed he hopes to add the unnamed player to his ranks early next week.
"I was supposed to be bringing a lad in on loan," Coleman told the club's official website. "But we haven't been able to complete that before this weekend. Hopefully we'll get something done next week.
"We just need a bit of cover (in defence)," he said. "Johnny Flynn is on international duty along with Billy Kee, so that's a big miss for us over the weekend.
"That will limit the options in our squad. I still think we need cover just in case because at the drop of a hat you can lose two or three defenders and we don't have a great deal of them."