The Japanese international had an injury interrupted campaign last time around.
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However, new boss Fabian Huerzeler has been delighted with how the winger has performed in pre-season.
Huerzeler said: “I think that he's not already 100%, but he made now two very good games and he was training every game.
“The training, he was there, so I think he tries to improve his physical condition.
“And, on the pitch, we see also today that he has unbelievable skills.
“We still have three weeks to go, so I think it will be improved day by day.
“I'm convinced and I'm sure that he will be 100% when the season will start.”