The forward from Italy, the No. 6 overall pick, was hurt during the Knicks' opener, a 97-94 victory over Cleveland on Monday. He rebounded from a scoreless first half to finish with 14 points, shooting 5-for-7 after halftime.
Gallinari didn't dress for New York's game against San Antonio on Wednesday. An MRI revealed no significant findings, and he will rest and get treatments the rest of the week in Las Vegas before returning to Italy.
Forward Renaldo Balkman sprained his left ankle in Wednesday's game. X-rays were negative and he is listed as questionable for Friday.