The Japan international is in his second season after arriving from Borussia Dortmund.
"Yes, you can’t help but improve here. There are lots of experienced players in this team; they have taught me a lot and every day I pick up new skills from them. Not many Japanese or even Asian players have benefited from playing at such a big club, so I think I’m very fortunate to be in this position. It makes me happy and proud," he told fans in a Twitter Q&A.
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