Bulls' Portis out 4-6 weeks with sprained MCL in right knee

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Chicago Bulls forward Bobby Portis will miss four to six weeks because of a moderately sprained medial collateral ligament in his right knee.

The Bulls announced Thursday he is out until at least late November. 

Portis -- averaging 10.5 points in his fourth season -- joined a lengthy list of injured Chicago players in the fourth quarter of Wednesday's win over Charlotte. 

Point guard Kris Dunn suffered a similar injury to his left knee in a loss at Dallas on Monday. He also missed the first two games for the birth of his first child. Lauri Markkanen is out until at least mid-November because of an elbow injury. And Denzel Valentine (sprained left ankle) has not played.

Chicago is 1-3.