Slot says it was an easy conversation with his fellow Dutchman.
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The new Reds boss said: "Initially I only contacted a few players. Before Jürgen (Klopp, his predecessor) left I didn't want to talk to everyone.
"I thought that would be fair to Jürgen and the players, because I wouldn't like it if my successor had called players before I left.
"It seemed logical to me to start with Virgil, which was an easy conversation for me because it could be in Dutch. Then I called a few others, but not too many, because many players had to prepare for the European Championship and the Copa América."