The 21-year-old understudy to Petr Cech has been ever present for his country in the World Cup qualifying campaign and has helped Atletico Madrid, where he is on a season-long loan, to second place in La Liga.
Barcelona are said to be monitoring his progress and defender Alderweireld, who also plays for Atletico, believes that is a realistic target for the man he claims could become the best goalkeeper in the world.
Speaking to Sky Sports News' Gary Cotterill, Alderweireld said: "He is incredible. He can do everything.
"He is good with the ball, he is good with his feet and he is great on his line. I don't think he has a weak point and I think he can be the best keeper in the world.
"I see him in training every day and I see him in games and I doubt there are any keepers better than him.
"He does not want to sit on the bench for eight games then play for one. He is very smart and I think it would be a good choice for him to maybe stay with Atletico, or go to another club where he will be number one."
And Colombia striker Radamel Falcao backed his former Atletico team-mate to go all the way when the pair met up for an international friendly last week.
"He is the best goalkeeper in the world, bar none," said the Monaco striker.
"That was very nice of him to say that," said former Genk keeper Courtois, who is remaining silent on his future despite reportedly being offered a new and improved deal by Chelsea.