The move is a technicality since Roberts -- who was placed on the DL with a concussion retroactive to March 26 -- wouldn't have been eligible within 60 days.
Roberts has been progressing well and going deeper into each game to get more at-bats. The plan is for him to make a final stop with Triple-A Norfolk on the team's road trip -- which starts on Tuesday -- to Rochester and Buffalo. His 20-day rehab period ends on June 11, thus his first game for the Orioles would be the following day if there's no setback.
Manager Buck Showalter said that the reports on Roberts have been positive and that he's counting on the second baseman to say how he feels given the uncertain nature of concussions. The plan right now is for Roberts to be able to play eight or nine innings when joining Norfolk.