Guiu, who has been capped by Spain at under-17 and under-19 level, is expected to fight for a place in Chelsea's first team under new boss Enzo Maresca.
"It's an immense joy to sign for Chelsea and I struggled to sleep ahead of the journey here because I was so excited," Guiu said. "Ever since I was small, it was my dream to play in the Premier League. Now I have the opportunity to come here to Chelsea and I will work my hardest to be successful for the club."
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