Zidan and Barrios produced wonderful interplay to help Dortmund thrash Nurnberg 4-0 at the weekend, stretching their unbeaten run to eight straight Bundesliga games.

"They are like windshield wipers before the defense. I do not know what language they talk, but communication is a problem," Klopp was quoted by RevierSport.

"Mohamed had a very good game. I am surprised that I still must explain how good he is."

Dortmund face a tricky test on Sunday as they visit German champions Wolfsburg at the Volkswagen Arena.

Dormund 4-0 Nurnberg