- Nick Friedell, Chicago Bulls beat reporter
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Gibson is listed as doubtful for Tuesday night against the Philadelphia 76ers at the United Center.
The Bulls already are short-handed with center Joakim Noah recovering from surgery on his right hand.
Nick Friedell covers the Bulls for ESPNChicago.com and ESPN 1000.
Chicago Bulls forward Taj Gibson sat out practice on Monday because of a concussion he suffered in the third quarter of Saturday's game against the Los Angeles Clippers.