The defender arrived at St Mary's Stadium from VVV-Venlo in August 2012 and has made 60 appearances for the club in that time – scoring three goals.
In his first season at the club he was a first-team regular at centre-back, making 32 appearances as Southampton finished 14th in the Premier League.
He has played more of a peripheral role this season under Ronald Koeman, though, making eight league starts - half of those coming in the final month of 2014 alone.
Having extended his stay on the south coast, the 26-year-old has flown out to Australia to link up with Japan's Asian Cup squad ahead of their first game in the tournament against Palestine on January 12.
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