Dier was speaking ahead of their clash with Burnley tonight.
“I call him Benjamin Button," said Dier, referring to the film character played by Brad Pitt who ages in reverse.
“I watched some clips of his saves over the years and it's the way he reads players so well, he's so strong one-on-one, his timing is so good, he moves his feet so well and he's definitely not slowing down, hence the nickname!
“He's a fantastic goalkeeper. The saves he makes... there are an elite group of goalkeepers who make saves you don't expect them to make, and he's in that group.
“The save from Gundogan, as that ball goes past me, I'm thinking he will be there. It's crazy to think it, but I'm thinking, 'don't worry, Hugo will be there'.
“There was another chance in the first half where Cancelo got through and instead of going across to him, and I'm worried about going across to him because it then frees up the cut back, you have complete trust in Hugo and for Cancelo to beat him from that angle would have to be something extraordinary.
“The saves, his sheer consistency, what he's done... to be honest, I think he still goes under the radar."
Spurs manager Antonio Conte also told the club's website: “First of all, a great compliment for Hugo, because to make 400 appearances, it means you reach a great achievement for this player and for Tottenham. He's our captain and not only an important player, but also an important person for the dressing room. He loves Tottenham. We are happy he stays with us and is our goalkeeper."