The Bucks announced today that rookie big man Johnny O'Bryant underwent an MRI over the weekend that revealed a grade III sprain in the MCL (medial collateral ligament) of his right knee. They also said that no surgery would be required and that O'Bryant has already begun to rehab the injury.
There is no timetable set for his return, but it's common for this type of injury to sideline a player for about 6 to 8 weeks, so it's likely that O'Bryant won't be back on the court until around Thanksgiving.
The 36th overall pick from LSU suffered the injury on October 9th against the Detroit Pistons and had to be helped off the court. He had only seen 14 total minutes of action in the preseason, tallying two points and three rebounds. O'Bryant wasn't expected to get a ton of minutes in a crowded frontcourt consisting of Jabari Parker, Ersan Ilyasova, Larry Sanders, and John Henson. Missing a big chunk of time, especially early in the season, isn't going to make matters any easier for him. We'll see how that all shapes out when he returns.