Former defender King, who amassed over 320 appearances for the North London club, has been dazzled by Alderweireld to the point where he feels the 27-year-old is now the league's preeminent centre-back.
“I've been highly impressed by him. I think he has been the best centre-half in the Premier League this season," King told Tribalfootball.com.
“He's performed at a very high level and has been a great signing for the club."
King was speaking as Tottenham's ambassador at the Melbourne launch of the 2016 International Champions Cup Australia, presented by Audi at the Melbourne Cricket Ground (MCG).
Tickets for the 2016 International Champions Cup Australia, presented by Audi are available to purchase fromticketek.com.au.