The 21-year-old England Under-21 international, who joined Spurs from Sporting Lisbon in 2014, played 36 games last season, including 28 in the league.
Dier has played mainly as a central defender or right back but has also been deployed as a holding midfielder by Tottenham manager Mauricio Pochettino.
(Reporting by Ed Osmond; editing by Toby Davis)
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