Liverpool have the option to sign Kabak on a permanent basis in the summer for £18million if he impresses during his loan spell from German club Schalke.
"Kabak is a good player," said Guido Schafer, a former team-mate of Klopp's at Mainz and a journalist currently covering RB Leipzig.
"He is very powerful and he has a good mentality. I think £18m is a good price for this player.
"The mentality is world-class from Kabak. He is not in his best performance now but I think he could be a good player for Klopp and Liverpool for the future."
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