The Washington Wizards will take on the San Antonio Spurs tonight, but there will be a familiar face missing from the sidelines.

Spurs coach Gregg Popovich has been away from the team since November 2 due to a “health issue,” but now we know what the mystery illness is, according to ESPN insider Shams Charania.

“San Antonio Spurs coach Gregg Popovich suffered a mild stroke on November 2,” Charania tweeted. “He is expected to make a full recovery and no timeline for return has yet been set.”

Popovich, 75, is the oldest coach in the NBA and has been with the Spurs since the 1996-97 season. He has undoubtedly been the face of the franchise throughout its dynasty, winning championships in 1999, 2003, 2005, 2007 and 2014.

With Popovich out, assistant coach Mitch Johnson has taken charge of the staff and has led the Spurs to a 3-3 record since his leave of absence began.

The Spurs will look to keep the winning ways going as the Wizards come to town tonight. Tipoff is set for 8:00 PM ET. The game can be watched locally on Monumental Sports Network or streamed on NBA League Pass.

Be sure to bookmark Washington Wizards on SI for the latest news, exclusive interviews, film recaps and more!