Boston Celtics guard Rajon Rondo will likely miss the remainder of the season after tests Sunday revealed a torn ACL in his right knee.

Rondo was hurt during Friday's double-overtime loss at Atlanta and had been receiving treatment for what was originally diagnosed as a hyperextended knee. He was a late scratch for Sunday's game against Miami and was instead sent to a Boston hospital for tests.

The team revealed the severity of the injury Sunday afternoon and said a date for surgery has yet to be determined.

Rondo, voted an All-Star starter for the Eastern Conference, is averaging 13.7 points and an NBA-best 11.1 assists in 38 games this season.