He has netted five times for the Scottish champions so far this season.
The Japan international is averaging almost a goal a game at the moment but is always striving to improve.
The American international returned to action against Lazio and also played 60 minutes against Kilmarnock. Speaking to the Scottish Sun, he said:"It was a bit of a difficult start to the season, with the new manager and then two new centre-halves joining.
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