The team made the announcement Thursday, one day after Thomas injured his knee early in the second half of the eighth-ranked Blue Devils' 64-54 victory against rival North Carolina.
Thomas has started all but one game this season for Duke (20-4, 8-2 ACC). The senior averages 5.7 points and 4.9 rebounds while bringing much-needed interior toughness for the ACC-leading Blue Devils (No. 7 ESPN/USA Today, No. 8 AP).
He was hurt in a collision with Larry Drew II with about 17 minutes left in Wednesday night's game.