The Dutch midfielder admits that he is facing an uncertain time, as he was involved in a touchline bust up with Feyenoord boss Giovanni van Bronckhorst.
Claise is on loan at the Dutch club. He was substituted at 1-1 after 77 minutes in a 2-1 win over Heracles and refused to shake his manager's hand, leading to a mini confrontation between the pair.
Clasie told De Telegraaf: "Of course my future plays a part in my mindset.
"Not directly during the matches, but unknowingly outside the competitions.
"Right now I just want to focus on conquering third place with Feyenoord. I want to close it here as well as possible.
"I don't have any influence on what will happen to me afterwards. But of course I play for my future, there is that realisation."