Slot has left Feyenoord and is now on Merseyside to kickoff his new job.
"He has a very good feel for what he has to tell the team in meetings, how he has to treat people, and whether he has to tickle someone," Trauner said to Flashscore.
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"He is of a very, very high level. I can definitely imagine that things will also go very well for him in the Premier League."
The 31-year-old added: "He was a very important factor in me coming to Feyenoord and has always relied on me.
"He's a tremendous specialist and has incredible ideas in terms of ball possession, build-up play and positioning. A lot of detail in running and passing. There is no pass without an idea behind it. He tries to move the opponents and find open spaces."