Faced with the prospect of playing in League One - and with Premier League interest mounting - the 25-year-old has made his feelings clear.
"When I joined Wolves, the club said to me the aim was to reach the Premier League together," Sako told the Observer.
"I am sad that has not happened, but I gave everything and have always been respectful to the club.
"At that first meeting, I sat with (former Wolves manager) Stale Solbakken and Jez Moxey (chief executive) and they told me if we didn't get promoted, the club would let me go.
"I was told I could speak to Fulham and now I don't understand the delay.
"I would like things to be sorted out. I am only being ambitious. I believe the fans will understand that."