Barca have drawn the Toon in the round of 16.
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Bojan told Sky Sports: "It'll be tough; all the matches are high-level.
"We know it'll be tough, especially in England, but the important thing for us is to always be ourselves. If we go into that match well, we'll believe in it."
Newcastle fans will get a chance to see up close Barca superkid Lamine Yamal.
Bojan added: "He's a player who's growing to a very high level. He's a great guy who enjoys working hard and helping his teammates. He's hungry for victory, and we're thrilled to have him with us."