Napoli have confirmed that striker
It comes one year after the Polish forward suffered a similar spell on the sidelines following a torn ACL in his left knee.
Milik picked up his latest injury in the final minutes of Napoli's 3-2 Serie A victory over SPAL on Saturday.
OFFICIAL: Napoli have confirmed that Arek Milik will be out for between 4 to 6 months after successful surgery on his right knee. pic.twitter.com/FHoFBMBDfh— Squawka News (@SquawkaNews) September 25, 2017
The injury he sustained last year was while on international duty with Poland, and it resulted in coach Maurizio Sarri utilising Dries Mertens in a central role as a false 9.
The Belgian has excelled as the focal point of Napoli's attack, although they could struggle with depth in the position with Milik now set for another extended absence.
The 23-year-old had made a promising start to the new season, scoring twice in his first three appearances.
October 2016: Arek Milik injures his left ACL.— Squawka News (@SquawkaNews) September 25, 2017
September 2017: Arek Milik injures his right ACL.
4 more months on the sideline expected. pic.twitter.com/iEq3gU80O7
And prior to his injury last campaign he had found the net five times from four starts for the Italian outfit.
Milik made his breakthrough in the Netherlands with Ajax, scoring 21 goals in 31 games in 2015/16.
Premier League clubs Arsenal and Tottenham had been linked with a move for the forward, but there interest is likely to have ended following another severe injury.