The Holland midfielder left the Reds for PSG this summer.
Klopp said, "We still have to see what we can do. It's early, not much has happened yet. We need to understand who will leave and if anyone wants to leave. Then let's see.
"Wijnaldum? We still have many midfielders even if it is true that replacing him will be very difficult, also for his human qualities.
"We will have to do it, it is a challenge but in some way we will succeed."
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