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Former team defender Ariel Ibagaza, as a free agent, is moving to play for the Piraeus team.
The 33-year-old footballer left Villarreal at the end of the season after both sides failed to agree on a contract extension. Ibagaza signed a two-year contract worth 1 million euros with Olympiacos.
"This will be a new challenge for my career," the defender said. "I am happy to have chosen a club with such history and traditions."