The former MVP has a medial meniscus tear. The timetable for his return was not immediately clear.
Rose had an MRI in Los Angeles on Saturday after he was injured the previous night at Portland.
The three-time All-Star sat out last season recovering from a torn anterior cruciate ligament in his left knee. Now, it’s his other knee that’s injured.
The injury occurred in the third quarter against the Trail Blazers.
Rose lost his footing while trying to change direction to get back on defense when Nicolas Batum stole a pass from Joakim Noah and started the other way. Rose limped across the court and couldn’t put any weight on his knee. After the Blazers scored, he came out of the game during a timeout.
It didn’t appear there was any contact on the play. Rose was unable to return and was on crutches afterward. He will not accompany the Bulls for the remaining four games on their six-game trip.
GRIZZLIES: Center Marc Gasol has a left knee sprain that won’t require surgery, but the reigning NBA defensive player of the year will be out indefinitely.
The team announced the sprain of his MCL after an MRI on Saturday.
Gasol suffered the injury early in the second quarter of Friday night’s loss to the San Antonio Spurs. Replays indicated there was little if any contact before Gasol grabbed his knee under the Spurs’ basket. He went to the Memphis locker room and did not return.
Gasol was second on the Grizzlies in points, rebounding and assists entering the game.
WIZARDS: Coach Randy Wittman is not sure when first-round draft pick Otto Porter will be able to play – or even practice with his teammates.
Porter has been sidelined since the start of training camp with a right hip flexor injury.
He was the No. 3 overall choice in the NBA draft after being an All-American at Georgetown.
Before Washington’s game against the New York Knicks on Saturday night, Wittman says: “When is that day going to be when he steps on the practice court? I still don’t know.”
Wittman adds, however, that Porter is “doing more and more stuff individually.”
There “was never a setback” for Porter, Wittman says, noting a hip injury is one that “different people heal differently from.”