Spurs made it three wins in a row in the Premier League, as they got the better of Watford 2-1 at Vicarage Road.
Argentina international attacker Erik Lamela put Tottenham in the lead in the 17th minute, and Odion Ighalo restored parity for the home team four minutes before the half-time interval.
Son Heung-min secured the three points for the North London outfit when he found the target in the 89th minute.
England international Dier started the game and played for the entire 90 minutes.
The 21-year-old, who can play as a right-back, a centre-back or as a defensive midfielder, has posted the following photo on Twitter.
The photo shows the strong bond between the Tottenham players and fans, who must be enjoying the football and the results at the moment.
Can't beat a late winner!! Great way to finish off the year!#COYS— Ben Davies (@Ben_Davies33) December 28, 2015
Tottenham are third in the Premier League table at the moment with 35 points from 19 matches, just four points behind current leaders Arsenal.