All clubs have until next Friday to complete their summer business and Thorn knows he may have to patient as he looks to land his target.
"There's one I'm waiting on that we were pretty hopeful we'd get," Thorn said at the club's Ryton training ground.
"Sometimes you have to wait a little bit longer when Premier League teams are going to let someone out, and also they want to play them in the cup.
"You have to be a little bit more patient, so we'll wait and definitely try and get one more in.
"We've just got to wait and see and wait for that to develop."