The 25-year-old has been targeted by Martin Jol following an impressive debut season in English football, but Kenny Jackett has hinted that a bid is yet to be accepted
The 25-year-old impressed during his debut season in English football but expressed his desire to move to a Premier League side following Wolves' relegation to League One.
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"Fulham are genuinely interested in Sako and now it is about negotiations between the two clubs," he told Birmingham Mail.
"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."