Pardew insisted the club's failure to land a new striker is not for want of trying, with confusion persisting over the future of reported long-term target Loic Remy at Marseille.
He said: "There is no doubt we are beavering away in the background to try to get players in.
"At the start of the window you get all sorts of mixed messages and it's very difficult to cement somebody down to a decision because they're waiting to see if another club gets involved.
"But it will accelerate as we get nearer the end of the window. The problem for us teams who perhaps need to strengthen is trying to get those decisions made."