Lowry already missed four games after sustaining the injury Nov. 6 at Oklahoma City. He was averaging 18.3 points and 6.3 assists through four games.
Also, the team announced Thursday that Landry Fields had surgery on his ulnar nerve in his right elbow on Wednesday in New York. Fields was dealing with tenderness in his right hand and will be reassessed in two weeks.
Alan Anderson will miss 3 to 6 weeks with a partly torn plantar fascia in his left foot.