Karius has returned to Liverpool but it is unlikely he will stay there next season.
And Florian Goll says he has yet to speak with the German about his future plans.
"Karius is still 26 and has a great career ahead of him," Goll told Fanatik (via Sport Witness ).
"He is now returning to Liverpool where he still has two years of the contract. We haven't discussed what we will do in the future. Let's see what will happen.
"Unfortunately, Besiktas' board have handled things pretty badly.
"We decided to keep calm despite the unpaid wages. Karius was ready to help the club during this situation but they never listened."