Butler sustained a similar injury on Sunday and re-aggravated it on Tuesday.
Butler: "My shoulder hurts. There's your update."— K.C. Johnson (@KCJHoop) February 11, 2015
Bulls head coach Tom Thibodeau told reporters after the game that Butler will have an MRI on Wednesday.
Butler is scheduled to play in his first career All-Star Game on Sunday. The Bulls' last game before the All-Star break is Thursday against the Cavaliers.
Butler had five points, two rebounds and two assists in 22 minutes before he was injured.
- Dan Gartland