Already without LeBron James and Danny Green on Saturday, the Los Angeles Lakers have also lost All-Star Anthony Davis.
David Stern, NBA commissioner from 1984 to 2014, was taken to hospital for emergency surgery, the league confirmed.
LeBron James is relishing Tuesday's opener against the Los Angeles Clippers.
Vogel on LeBron as a true point guard: "We certainly aren’t going to ask him to do anything he hasn’t done his entire career.”
Green explained that he wanted to sign with a championship-winning team, and felt the Mavericks were too far off from that.
Green had said publicly he would be open to returning to the Raptors, but a report said he told the team he would not be back.
Kawhi Leonard is off to the Los Angeles Clippers, and Danny Green to the Los Angeles Lakers, but the Toronto Raptors have no hard feelings.
Leonard is bound for the Clippers, Green is headed for the Lakers, and the Raptors will be looking to fill two key holes on their roster.
Danny Green and JaVale McGee are among four players expected to sign with the Lakers after Kawhi Leonard joined the Clippers.
Danny Green, Kentavious Caldwell-Pope and JaVale McGee are all expected to sign with the Lakers after Leonard joins the Clippers.