Miles had an operation Wednesday to repair ligament damage. He was hurt in Washington’s 117-104 loss at the Denver Nuggets on Nov. 26.
The Wizards say there is no timeline for his return. Miles is averaging 6.4 points in 10 games this season, his first with the Wizards.
He is part of a lengthy list of missing players for Washington, which is 6-13 heading into its game against the visiting Philadelphia 76ers on Thursday night.
All three centres on the roster — Thomas Bryant, Ian Mahinmi and Moe Wagner — are out with injuries.