The Boston Celtics forward had 17 points, with 15 coming in the third quarter, on 6 of 7 shooting in 15 minutes before suffering the knee injury in Italy’s 91-84 home win over Georgia.
Italy matched Spain at 5-1 on top of Group L.
The 34-year-old Gallinari in June signed a two-year $13.3 million deal with the Celtics.
Gallinari averaged 11.7 points, 4.7 rebounds and 1.5 assists with the Hawks last season.
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