There is no such thing as a 60 day DL for the minors. Once the decision was made in March to option him to AAA and place him on the DL there, that ship sailed. I doubt it would be allowable to retroactively place him on the MLB DL unless his agent was successful with some sort of grievance. Which, frankly is possible and would likely even be successful. He was optioned because he pitched poorly in ST. He presumably was pitching poorly because of the injury. His agent could argue that Chargois should have been medically evaluated prior to being optioned.