Slot will move to the Reds at the end of the season for a fee rising to 11m.
"If you see such a lump sum paid by Liverpool, which simply pays thirty million euros for very simple players, isn't it laughably low?" Kraay Jr said on Goedemorgen Eredivisie.
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"I find it laughable!
"It almost makes me sad that Slot is worth as much as a very mediocre left back from Ajax, Gastn vila.
"Arne Slot has to manage fifty people."