Helsley (elbow) could start a rehab assignment as early as Monday, MLB.com reports.
Helsley threw a bullpen session ahead of Friday's series opener in Toronto. If all continues go well in his recovery from right elbow inflammation, the hard-throwing right-hander appears to be on track for a mid-June return to Baltimore's bullpen. Until Helsley is back in the fold, the Orioles should continue to deploy Rico Garcia as their primary closer.