Nakamura has been linked with a return to Japan in recent weeks as his contract with the Bhoys expires at the end of the season.
“Maybe I will stay here, maybe I will move to another league or maybe I will go back to Japan,” Nakamura told the Daily Record.
“No one knows – I don’t know.
“However, I want to concentrate only on Celtic for the moment.
“I am only interested in winning the title for the fourth season in a row.
“That is more important to me than my future.
“I don’t know if I am going to stay.
“I could have left in January but the situation changed and you never know what can happen in the summer.
“I am not worried about it. I am concentrating only on winning the next match.”