The Borussia Dortmund boss insists his goalkeeper deserves to be acknowledged as the finest despite conceding far more than Bayern Munich's Manuel Neuer
The BVB shot-stopper earned many plaudits during the previous campaign, particularly in the Champions League where he caught the greatest number of crosses and thwarted the most one-on-ones (14) en route to the final.
And Klopp has no doubt that the 32-year-old ought to be a front-runner for the title of best on the planet.
"I do not know the rules according to which a decision is made [on the World's Best Goalkeeper title]," the 45-year-old said.
"But this year he was the best goalkeeper in the world. That is so."
Die Schwarzgelben conceded 42 goals in the Bundesliga this season while Manuel Neuer shipped just 18 at champions Bayern Munich, but Klopp does not see this as significant in determining Weidenfeller's quality.
"Despite this number, it is difficult to find any real errors," he added in defence of his goalkeeper.
World's Best Goalkeeper is an award that has been given annually since 1987 by the International Federation of Football History and Statistics to the outstanding goalkeeper of the year.
Real Madrid's Iker Casillas has claimed the prize for the previous five years but looks extremely unlikely to continue that run after his highly-publicised bust-up with coach Jose Mourinho and a lengthy layoff through injury.