"If I do have to take a step down a level or two to establish myself as a regular, I will do that," McCarthy told the Evening Post.
"I am prepared to move if it means I get the chance to play first-team football. I have thoroughly enjoyed my time at Meadow Lane. It is a good club.
"I haven't spoken to the manager about it but I wouldn't mind coming back. We will have to wait and see what happens."