The inquiry into Atlanta Hawks owner Bruce Levenson began with general manager Danny Ferry referring to free agent Luol Deng as still having "some African in him" on an organizational conference call, league sources with direct knowledge of the probe told Yahoo Sports.

"He's still a young guy overall," Ferry said, league sources with direct knowledge of the probe told Yahoo. “He's a good guy overall. But he's not perfect. He's got some African in him. And I don't say that in a bad way."

Deng, considered one of the highest character players in the NBA, was born in the Sudan.

The call with the ownership group had been set up to inform them of free-agent options on the market in July.

Ferry reached out to Deng and Deng's agent, Ron Shade, on Monday, Shade told Yahoo Sports. Ferry hadn't yet spoken to Deng, but he did talk to Shade, a Chicago-based agent. "I have no reaction, but we've spoken," Shade told Yahoo.

The racial reference to Deng triggered at least one team owner on the call to pursue an independent investigation into how the organization operated in regard to race. 

The search uncovered the 2012 email that Levenson sent to Ferry and two minority owners that ultimately led to Levenson's decision, under pressure, to sell his stake in the Hawks.