Zach LaVine scored a team-high 26 points, Otto Porter Jr. added 22, and the Bulls held on for a 112-106 win over the Pistons on Friday night at the United Center.
Rizzo will have an MRI on Monday to determine the severity of the injury. Initial X-rays did not reveal a fracture, Cubs say.
Shirley replaces Nick Hostetler, who was named special assistant to the GM in July.
Bryant took the brunt of the collision as his upper body slammed against Heyward’s right shoulder and torso.
The Cubs pounded the Cardinals to climb to the top of the NL Central standings. Since starting 2-7, the Cubs have won 17 of 22 games.
Has Javy Baez become the best player on the Cubs?