Williams (foot) has already been ruled out for Wednesday's game against Milwaukee and will also miss Chicago's back-to-back set Friday versus Atlanta and Saturday versus Memphis, K.C. Johnson of NBC Sports Chicago reports.
Valanciunas notched 18 points (8-11 FG, 2-2 FT), eight rebounds, three assists and two blocks across 18 minutes during Monday's 134-106 loss to the Knicks.