Don Vaden, a former NBA referee and the league's current coordinator of officials, has replaced Bernie Fryer as director of officials, league sources said Friday.

Fryer succeeded Ronnie Nunn as director in 2008, but has been dealing with health issues over the past two years.

Former NBA referees Joe DeRosa, Joe Forte and Sean Corbin are expected to be added as advisors whenever the league returns to action from the current NBA lockout, sources said.