The 21-year-old was in the Spain squad which retained the European U-21 Championship, and has signed a four-year deal.
“I’m very excited about moving to England to play for Stoke City," Muniesa said, "and will do everything I can to help the club.
“It wasn’t a big decision for me to make. I came to England yesterday to meet the people at the club and look around the training ground, which is very impressive.
“My season only finished a fortnight ago when the European Championships ended, but I can’t wait to get started for Stoke. I would start tomorrow if the club asked me to.”
Manager Mark Hughes said the lure of the Premier League brought Muniesa to the Potteries.
“I know he’s very highly-regarded in Spain," Hughes said, "and was attracting interest from clubs in La Liga, but he’s an ambitious young man and wants to test himself in English football.”
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- Stoke City