Piotr Zielinski gave the visitors the lead before Ferran Torres from the penalty spot earned Barcelona a first-leg draw in their Europa League playoff.
Xavi said, “This is a great team, I said yesterday in the press conference we were really unlucky in the draw.
"They have a lot of quality in attack, are solid in defence and it will be a very, very difficult tie over two legs."
Pierre-Emerick Aubameyang was given a first start for Barca.
Xavi added: “We'll see how it goes. Auba is training very well, that is why he is in the starting XI. I always choose whoever deserves to play based on my sensations in training and that will continue under my tenure."
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