"We have received three concrete offers for the services of Papiss Demba Cisse," Keller told Deutsche Presseagentur.
"All three are from clubs in foreign leagues.
"We are going to consider these offers calmly, but this doesn't necessarily mean we are definitely going to sell him."
Cisse's agent Guido Nickolay told BILD: "I'm actually on a journey abroad. In this case I am looking into everything and I hope that in the end every party involved is satisfied."sbobet