The Chicago Bulls are worried about the possibility of paying the $250,000 bonus in Taj Gibson's contract if he makes the NBA All-Defensive second team and how that would impact their total salary in regards to the luxury tax, according to a report.

The Bulls thought they had wiggle room on the luxury tax after trading Luol Deng but are now reportedly worrying about Gibson's potential pay.

The Bulls have played with just 12 players on their roster and will have to sign a 13th player by Feb. 14.

Gibson signed a four-year contract extension with the Bulls on October of 2012.