The Bulls suffered their first significant injury of training camp Tuesday as backup center Aaron Gray went down with a stress fracture of the lower left leg. He is expected to be sidelined for six to eight weeks, which means he'll miss the first month of the regular season.

"We're disappointed because Aaron came into camp in good shape and had been playing well," general manager Gar Forman said.

Gray, a 7-foot, 270-pounder, was re-signed last week to a one-year deal for a little more than $1 million.