The Hungary captain has been outstanding for the Reds in a difficult campaign.
Slot insists Szoboszlai is the best "pressing" player in world, explaining: "Dominik has so many qualities. He's a complete player, an all-round midfielder who, in my opinion, perfectly embodies the role of the modern holding midfielder.
"Last season he was already very good, primarily out of possession and partially with the ball at his feet; I think he's significantly improved his possession play this season."
In terms of pressing and winning back possession, Slot insists Szoboszlai is the best in the world.
He added, "When it comes to non-possession, he's among the top three, four, or five in the world. And he's probably the absolute best in the world at pressing ability."