Nurnberg director of sport Martin Bader had insisted a decision must be reached by the weekend but, with that deadline looming, Koller's agent Pavel Paska insisted the deal was not dead.
. He told www.idnes.cz: "The clubs are still negotiating."
Even if the deal does not come off, it appears the 34 year old will not be joining Fulham.
New boss Roy Hodgson had been linked with a move for the Czech Republic international, but Paska insisted that would not happen.
"England is ruled out," said Paska. "He will go to Germany or he will stay in Monaco."