Jackett confirmed to the Birmingham Mail that the Cottagers are the favourites to land the 25-year-old.
"Fulham are genuinely interested in Sako and now it is about negotiations between the two clubs," he said.
"As far as I know no fee has been agreed yet, but they are in negotiations. I don't know if it is close. The offer's at a very high level, whether it is at a point where the powers that be at Wolves want to accept that or not is another matter.
"He's not one I thought would necessarily be with us in League One at the start."