The person, speaking on condition of anonymity because details had not been made public, said Friday that the 28-year-old Pridie's infraction was for a drug of abuse rather than a performance-enhancing drug. The San Francisco Chronicle first reported Pridie's violation.
Pridie, a center fielder, batted .231 with four home runs and 20 RBIs in 101 games last season for the New York Mets.
Two 50-game suspensions were announced Friday for violations of the minor league drug program. Toronto pitcher Mitchell Taylor and free agent pitcher Matthew Rusch were each penalized for a second violation for a drug of abuse.
Taylor is on the roster of Bluefield of the rookie-level Appalachian League. The 28-year-old Rusch was in the Detroit organization from 2005-10 and the Boston organization last year. His suspension would start when he signs with a major league organization.
Twenty players have been suspended this year under the minor league drug program, including seven for drugs of abuse.