Edit: removed incorrect info.
Sapkowski was a fan of his amongst many others and was inspired to begin writing fantasy but ultimately the characters and stories are not very similar.
from an interview
“Me and fantasy, it was love at first sight. I remember reading Tolkien for the first time, in the sixties – Tolkien was published in Poland in the early sixties, practically at the same time as in the United States.
I was utterly enchanted. Then Ursula Le Guin with Earthsea, Roger Zelazny with Amber, Michael Moorcock with Elric of Melniboné, Jack Vance with Lyonesse, Stephen R. Donaldson with Thomas Covenant, Marion Zimmer Bradley with The Mists of Avalon. In 1985, when “Fantastyka”, then the only Polish SF magazine, announced a literary competition, I decided – till today I don’t know why – to take part and write a short story. A fantasy short story, of course. And so it started.”