The Nationals transferred Doolittle (elbow) from the 10-day injured list to the 60-day IL on Wednesday, Jessica Camerato of MLB.com reports.

The transaction clears a spot on the 40-man roster for waiver pickup Cory Abbott while ensuring that Doolittle is sidelined for the foreseeable future after news of his left elbow sprain first surfaced following his April 19 appearance against the Diamondbacks. According to Jesse Dougherty of The Washington Post, Doolittle received a PRP injection last week and will be shut down from throwing for the next six weeks, so he'll likely be sidelined through the All-Star break.