The Reds are set to take on the Lisbon-based powerhouse in the Champions League quarter-finals on Tuesday, with the first leg taking place in Portugal.
And Klopp has said he couldn't understand anything Spanish-speaking Diaz had to say on Liverpool's Portuguese opposition.
He said at a press conference: "He [Diaz] tried for 10 minutes but I didn't understand a word.
Klopp added of Benfica: "There is a lot of quality and experience in this team. It is an interesting challenge. That is how it should be. I am really happy and I am really looking forward to it."
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