Tottenham recruited Dier for £4m from Sporting Lisbon in 2014. Following a season of playing in defence, Pochettino transformed him into the classy defensive midfielder instrumental to much of their progress.
Tomorrow [Wednesday] they host Monaco at Wembley Stadium in their first Champions League fixture for five years. Dier is expected to retain his place and continue his long-term midfield partnership for club and country with Dele Alli after Saturday’s 4-0 Premier League win at Stoke.
He said: “There are many reasons I wanted to commit my future to Tottenham. We have a fantastic squad full of young, exciting players. We’ve got the new stadium on its way, the fantastic facilities at the training ground, and a fantastic manager who’s great for all us young players.
“He really looks after us, and makes sure we keep improving.
“Wembley being filled with 80,000 or more Tottenham fans is going to be an amazing experience. Playing in the Champions League there is very unique, so those two things are going to be fantastic.”