Coach Fred Hoiberg said Tuesday that Dunn was injured going for a layup in the second quarter of Monday's loss at Dallas. Dunn stayed in and finished with nine points and seven assists after missing the first two games of the season for the birth of his first child.
Dunn averaged 13.4 points and 6.0 assists for Chicago last season after struggling as a rookie with Minnesota. The Bulls were already missing Lauri Markkanen until at least mid-November because of an elbow injury. And Denzel Valentine has not played because of a sprained left ankle.
Chicago — 0-3 — hosts Charlotte on Wednesday.