Gotze broke into the first team at BVB under Klopp and was the subject of interest from the now Anfield boss during the close-season after an underwhelming spell with Bayern Munich.
The Germany international eventually snubbed a move to Liverpool in favour of a return to Dortmund, but he has since struggled to live up to expectations with his former side.
Nevertheless, Klopp is adamant his one-time pupil can become a key figure in the Bundesliga once more.
“Mario has often gotten injured at unfortunate moments and has not really gotten into a rhythm yet,” Klopp told Bild am Sonntag. “But there is still a world-class footballer inside Mario, just like before. You do not just forget how to play football, it’s like cycling.
“Mario’s next challenge will be to find consistency. I have no doubts about it that he will bounce back. He has no reason to worry.”
