The 28-year-old Poland star insists the visitors will show what they can do when they run out at Parkhead in the Champions League. Shakhtar are hoping to bounce back from their recent inconsistent results in the Ukrainian league.
Asked if he thinks they are better than Celtic Lewandowski replied: "It´s in the papers at the moment, but we have to prove it on the pitch - and that will be a different story."
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