The Tottenham Hotspur striker heaped praise on his team-mate.
It was a forgettable night for the English national side as they lost 2-0 to Spain but Tottenham's Dier will likely never forget the game for personal reasons.
And his team-mate at both club and international level feels he deserves the call-up, also suggesting he has a bright future ahead of him.
Kane told the FA site: "I'm delighted for him, he's been great this season and fully deserves it. He did well when he came on, he didn't look out of place.
"The future's bright, he's still only young and it would have been a great experience for him."
Both England youngsters are fine examples of what is driving Tottenham's good recent form.
Dier and Kane are equally young but have shown maturity beyond their years (so too has Dele Alli).
While Kane has thrived up front, though, 21-year-old Dier's success is arguably even more impressive, simply because he has made the transition to a whole new position - from defence to holding midfield.
Roy Hodgson could do much worse than give the Spurs midfielder an extended run within the England team ahead of the Euros. But the Three Lions boss probably has Jack Wilshere in mind for that role when he returns from injury...