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Defender Mario Alberto Santana has agreed to represent the club next season.
The Argentine defender will become a free agent this month and has already accepted an offer from Napoli.
"I am very happy," he said. "We have been talking since January, but at first we couldn't come to an agreement. I can't wait for the season to start. I am already dreaming of the Champions League."
Santana will earn 900 thousand euros per season. The amount could increase due to bonuses.