The Feyenoord coach will replace Klopp at the end of the season.
After today's 2-2 draw at West Ham, Klopp said: "If I don't know a manager personally I can only touch the subject from watching their team and the way they play football.
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"Feyenoord are a really, really good football team, and he is definitely a really good manager. I am happy for the club if it happens. I don't know it for sure.
"It is not too important if I am happy, other people make the decisions and they will do it right, so I am happy."