The midfielder has been given his chance by Barca coach Hansi Flick this season and is now in the Spain squad for the first time.
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"He surprised us a lot. We already knew he was very good because I knew him from training and from my last year at Barça," said Busquets on Cadena Cope.
"Casadó is playing at a superlative, spectacular level, moving the team and also giving assists."
He added on Flick's Barca: "They are playing very attractively and very quickly.
"It's a somewhat different style."