Boston Celtics guard Jaylen Brown, who escaped serious injury when he hit the back of his head and neck while falling to the floor in Minnesota on March 8, was back in action Sunday in Sacramento after clearing the NBA's concussion protocol.
Irving is expected to miss three to six weeks after undergoing surgery Saturday on his injured left knee.
The Celtics announced that Irving's knee is "completely structurally sound" after undergoing the "minimally invasive procedure." He has been out since March 11.
Smart said he is confident he'll be back on the court for the postseason after undergoing thumb surgery two weeks ago.
Smart suffered a complete tear of the ulnar collateral ligament in his right shooting hand while diving to the floor in a game against the Indiana Pacers earlier this month. A hand specialist in New York advised immediate surgery with hopes that Smart might be able to return sooner than the six-to-eight-week timeline the team announced after surgery.