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Great attention of the major English clubs this summer was drawn to the full-back Alvaro Pereira, who linked his future until the summer of 2016.
The 25-year-old footballer, who was sought after by London's Chelsea and watched by Liverpool, will be able to leave for a 30 million euro release clause, according to the conditions of the new contract.
This season, Pereira played four matches in the Portuguese championship and appeared in the starting lineup in the Champions League.
During his career, he has also worn the jerseys of Miramar Misiones, Quilmes, Argentinos Juniors, and CFR Cluj.