The 23-year-old signed for Stoke this summer from Barcelona in a £1million deal.
Sidwell told Talksport: "Bojan has looked very impressive and very sharp during pre-season, and he's scored some goals as well.
"But it's what you expect when you look at the teams he has played for, especially his education at Barcelona.
"He's a great prospect for us, he's an exciting player and I'm looking forward to seeing him in action when the season begins."
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