Weiner said the interview will be non-disciplinary in nature but declined further comment.

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

MLB's desire to interview Rodriguez was first reported by ESPN.com.

During a news conference Tuesday, Rodriguez said he had been injected with a banned substance from 2001-03 while with Texas. He said the substance, which he called "boli," was obtained by a cousin in the Dominican Republic whom he would not identify.

Sports Illustrated reported Feb. 7 on its Web site that Rodriguez's name was on a list of 104 players who tested positive for steroids during baseball's 2003 anonymous survey and said he had tested positive for Primabolin and testosterone.

A baseball official, speaking on condition of anonymity because he was not authorized to make public comments, said MLB would like to learn the identity of the cousin and the source of the "boli" that he obtained and injected into Rodriguez. The official said MLB hopes to conduct the interview while Rodriguez is at spring training with the Yankees and before he joins the Dominican Republic team that plays its first pre-World Baseball Classic exhibition on March 3.

Rob Manfred, MLB's executive vice president for labor relations, did not respond to an e-mail seeking comment and Rodriguez's agent, Scott Boras, confirmed he had been contacted by Weiner but otherwise declined comment.