The Japan international is frustrated in the Russian Premier League and insists that he wants to depart the club in a bid to freshen his career.
"It's agonising," he said.
"I can't stay like this. I said I wanted Japan to win the World Cup. I was MVP at the Asian Cup in January but I'm still not happy with things.
"Right now I'm in a rut still being at CSKA. This wasn't what I planned. If I don't accept it, I can't live my life. But if I get too used to my circumstances I'll come to a halt.
"That scares me."