As the club looks to move on from the Jurgen Klopp era, Slot will be hoping to make his own mark on the squad.
Turkish outlet Fotospor claim that Benfica midfielder Orkun Kokcu is a serious target.
Kokcu played for Slot at Feyenoord before moving to the Portuguese club a year ago.
"Schmidt ties me too much to all kinds of defensive tasks," said Kokcu of his current boss Roger Schmidt at Benfica.
And that is not positive if you really want to get the most out of my qualities. I am the type of player who finds solutions in the area, who thinks very quickly and makes the team progress.
"Even this season, all my statistics underline that. I can do much more for Benfica and that may be where part of my frustration lies. I was irritated and disappointed with that."