The Major League Baseball Players Association is negotiating with MLB officials on a possible 10- to 15-day suspension for outfielder Jose Guillen for his reported involvement in the purchase of steroids and human growth hormone, sources told ESPN The Magazine's Buster Olney on Wednesday. The San Francisco Chronicle reported last month that Guillen bought nearly $20,000 worth of steroids and human growth hormone from 2003 through 2005. Major League Baseball began testing for steroids in 2003, and penalties for first offenses began in 2005. HGH was banned by MLB in January 2005. "We told the commissioner's office my version of this whole affair, which in some ways has been handled with some errors in the media," Guillen was quoted as saying Tuesday by ESPNdeportes.com when asked about the situation.