The Japan international, capped 101 times, joined the Serie A club from AC Cesena in 2011.
The 31-year-old has made 11 appearances in the league so far this season for Inter, who are currently fourth in the standings on 44 points.
(Reporting by Silvia Recchimuzzi and Oben Mumcuoglu in Gdynia; Editing by Christian Radnedge)
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