Bulls notebook

Forward Tyrus Thomas (below) had successful surgery Saturday to repair the fractured radius in his left forearm. He will be out four to six weeks. ''We texted back and forth,'' coach Vinny Del Negro said. ''He needs some rest, and he's a little drugged up right now. He's had a long day, but everything went well. He gets re-evaluated on Tuesday.'' ... With Thomas out, the Bulls are down to 10 healthy players. They have two open roster spots, so signing another player is an option, especially because Thomas will be out at least a month. ''We're talking about that right now,'' Del Negro said, referring to himself, general manager Gar Forman and vice president John Paxson. ... Because the Bulls are so close to the luxury-tax threshold, they won't sign anyone for more than the league minimum. Chris Richard was the last big man cut in training camp, but they also might go with guard Derrick Byars because they have enough bodies upfront for a nice rotation even with Thomas out. .....