Richard Kleiman discussed Durant's future during the Wall Street Journal's The Future of Everything Festival on Tuesday night.
"That is 100 percent undecided," Kleiman said. "I'm waiting on Kevin, you know? That's the truth. I think there's a feeling that this thing is like war games and everybody's kind of like playing chess years out.
"But when somebody gets to the level of basketball that he's at, you can't juggle focus like that. He's not scripting his future while playing the way he plays and practicing the way he's practicing.
"He really doesn't know and I really don't know."
The Warriors already booked their fifth consecutive trip to the NBA Finals with a series sweep of the Portland Trail Blazers in the Western Conference finals. Durant, who hasn't played since Game 5 against the Houston Rockets in the Western Conference semifinals, is in rehabilitation for a right calf strain that he suffered in that contest.
Golden State hasn't offered a timetable for when Durant could rejoin the team. He is averaging 34.2 points, 5.2 rebounds and 4.9 assists per game this postseason.