O'Driscoll, despite having a number of important first-team players' contracts due to expire next summer, said that during the window with active agents is not the best time to open discussions with a player.
"The situation works both ways," O'Driscoll told the Nottingham Evening Post. "Players have an opportunity to run their contracts down; that is just the way the industry is.
"Agents are not going to be keen to do a deal when the transfer window is open and there is a possibility of getting something done [elsewhere].
"It is always going to be a cat and mouse thing. However, once the window closes, then it is a sensible time to negotiate and try to get things done."
Forest face Charlton Athletic at home on Saturday to try to keep their unbeaten start going.