The Neapolitan club said the 23-year-old suffered a complex lesion and that he would recover in a time frame similar to his previous knee injury.
Milik, capped 36 times by his country, suffered a cruciate ligament injury to his left knee last year which sidelined him for four months.
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(Reporting by Silvia Recchimuzzi in Gdynia, editing by Ed Osmond and Clare Fallon)
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