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Gretas officially joined Antonio Cassano on Monday, signing a three and a half year contract.
The footballer arrives from another Italian club, Genoa's "Sampdoria", which he left due to disagreements with the president. The amount paid for him as compensation is not reported.
The former "Bari", "Roma" and Madrid's "Real" striker will be able to debut for his new team in Thursday's match against "Cagliari".
This season, Cassano played 7 matches in the "Serie A" championship and scored 4 goals.
