As Lijnders gets ready for his first managerial job at Red Bull Salzburg, he took the time to assess the Reds' future under Dutchman Slot.
"I know Arne really well," Lijnders told The Athletic.
"He came to my house in Holland about nine years ago. He came to speak to me about football. He drove for a long time to see me and he had a thousand questions. I tried to answer them all!
Since then, we've stayed in close contact. He's an unbelievable coach, who knows exactly what he wants and has the experience to be at a club like Liverpool.
There are similarities between Feyenoord and Liverpool. Their fans are so passionate. They also sing You'll Never Walk Alone."
Lijnders added: You need a coach like Arne who is close to what we tried to do over the years, in terms of having the ball in the opposition half, pressing, counter-pressing - he's very strategic in that point of view. He's made good steps and now it's the chance for him to make another big step.
When I spoke with Mike (Gordon) and Jurgen, I said you need a young coach who can grow with this new team. Arne has everything in him to be a success here."