Bucks general manager John Hammond said Monday night that Parker had surgery in New York to repair the torn anterior cruciate ligament. There is no timeline for a return to basketball activity.
The No. 2 pick in last year's draft was averaging 12.3 points and 5.5 rebounds in 25 games before getting hurt on Dec. 15 at Phoenix.
Also, Bucks coach Jason Kidd - talking on WTMJ radio in Milwaukee - said center Larry Sanders might return in a couple days, if not for Tuesday's home game against Phoenix. Sanders has missed six games because of the flu and what the team called personal issues.