Last summer's £2.2million signing from St Etienne wants to quit Molineux following the shock relegation to League One and he has his sights on the Premier League.
Sako, who was Wolves Player of the Year last season, believes he has kept his side now wants chief executive Jez Moxey to keep a promise that he could leave if they did not earn promotion from the Championship in 2012/13.
"When I joined Wolves, the club said to me the aim was to reach the Premier League together," said Sako.
"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 [the former Wolves manager] Stale Solbakken and Jez Moxey 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. In the difficult moments we had last season, they were very good to me and I hope they saw someone who gave everything back to them.
"I will never speak badly of the supporters."