The 27-year-old, a member of Argentina's World Cup squad in 2014, joined English club Sunderland on loan last season but has not played a competitive game since March.
"Ricky Alvarez is a quality player... and has perfect technique," Sampdoria coach Vincenzo Montella told a news conference on Monday.
Alvarez could make his debut on Tuesday in a derby Serie A match against Genoa.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
(Reporting by Bartosz Dabrowski and Agnieszka Slupska in Gdynia, editing by Ed Osmond)
Share
