Warnock, who has completed the permanent signing of Michael Tonge from Stoke and drafted in Everton teenager Ross Barkley on loan in time for Saturday's derby clash at Barnsley, is hoping to strengthen his squad for a concerted promotion push during the second half of the season.
The club's new owners GFH Capital confirmed money would be made available for new players this month when they completed their takeover just before Christmas and Warnock will meet with chief executive Shaun Harvey on Friday to further discuss his recruitment strategy.
Warnock said: "The squad itself is in tip-top shape, we just need that little bit which we're looking for, to bring in to give us more strength from the bench and a bit more positivity from the side areas.
"But it's a nightmare for managers this transfer window really because I've already spoken about seven or eight players and they're not for sale, no matter what the agents told me, that they were all available.
"They tell you he's available and he'll cost you this, but when I speak to the managers I find out none of them are available. So that shows you how difficult it is. That's seven or eight players on my list and not one of them is available, they're not going to let any of them go."
Warnock added: "Me and Shaun are having a meeting (on Friday) specifically to go through one or two things that have cropped up and that's the way forward.
"We've got to try and come up with people who are available or who we can get out for a transfer fee. We're actively looking, absolutely and waking up thinking about it as well and thinking about it last thing at night. It's a nightmare for managers.
"We're looking for another couple to mix things up, to change things and there always the most difficult ones to get."