Van Persie has just hung the boots after completing a final season with Feyenoord.
He told Voetbal International: “They play with four at the back and before that two blocks of three and those two blocks constantly cover each other at the back. It's nice to see how that works together, there must be heaps of work, there is no other way.
“They have to trust each other, those players. If one goes, the other must be at his back, and another at his back.
“For Klopp, it must also be cool, to see that his philosophy is really in that team. The same goes for the Manchester City of Josep Guardiola, which plays in a different way, with short combinations and position play. I enjoy both."