Major League Baseball investigators want to meet with Alex Rodriguez to get a more detailed explanation of his admitted experiences with performance-enhancing drugs, and the players union has been contacted by the Commissioner's Office to set up the interview.

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ESPN.com first reported MLB's plans to question the Yankees third baseman, basing it on two sources, and The Associated Press got confirmation from union general counsel Michael Weiner, who told the AP that the interview would be "non-disciplinary in nature."

According to ESPN.com's sources, investigators intend to question Rodriguez on several points omitted from his two televised confessions, with ESPN's Peter Gammons and on Tuesday upon his arrival to the Yankees' Spring Training camp in Tampa, Fla.:

• The extent of the drug use he claimed was limited to the 2001-03 seasons with the Texas Rangers.

• The identity of the unnamed cousin whom Rodriguez credited with turning him on to and providing the drug believed to be methenolone, an anabolic steroid.

• Whether the cousin had access to Major League clubhouses and hence other players.

• Whether Rodriguez or his cousin supplied drugs to other players.

That last point is critical to any possible punishment of Rodriguez. He cannot be punished for taking banned substances prior to the 2004 implementation of the sport's current drug policy. However, if MLB were to determine he provided drugs to other players, he could be subject to punishment.

ESPN's sources indicated that MLB must formally request a meeting with Rodriguez through the Players Association. The player would be allowed the company of a lawyer and a union representative at any meeting with investigators.

Because he is on a 40-man roster, Rodriguez has the right to have a union representative be present during any interview with management.