At issue is the value assigned to the 21-year-old, who has played just 21 games since Fremantle took him with pick 42 in the 2005 NAB AFL Draft.
Carlton's general manager of football operations, Steven Icke, said despite talks between the clubs, a trade was no closer.
"Nothing – we've been to mediation which was good from the point-of-view that both parties have now gone away to talk to their respective camps," Icke said.
"We were talking anyway before mediation, and I think we were a little bit naïve as to what the mediation process was all about, but at least we've been talking.
"We'll continue to talk and see where it takes us.
"We're hopeful that we'll be able to get a fair and reasonable exchange done, but as I stand here now, we're still no closer to an outcome."
Fremantle has been insisting that Warnock is worth a first round pick, while Carlton has been just as adamant that their early second round pick is correct.
Talk from outside the clubs has speculated that the side issue of players or additional picks has been the problem, but Icke said it was nothing that complicated.
"No, no, no. The sticking point is that they don't think that 24 is fair and reasonable."
If Warnock is not traded by Friday's 2pm (AEST) deadline, he can enter December's pre-season draft where Carlton could again pursue his services.
