Ochoa's goalkeeping, including a string of stellar saves in a 0-0 draw with host Brazil, helped Mexico reach the round of 16 at this summer's World Cup.
The 29-year-old Ochoa played for French club AC Ajaccio for the past three seasons but was a free agent. He calls playing in the Spanish league ''a dream come true.''
He will replace Willy Caballero, who left for Manchester City this offseason.
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- Guillermo Ochoa