Clippard announced his retirement from baseball Thursday.

Clippard cleared waivers and was released by the Nationals on Thursday, Bobby Blanco of MASNSports.com reports.

Clippard was designated for assignment by the Nationals on Tuesday, Jesse Dougherty of The Washington Post reports.

Clippard (groin) was reinstated from the 15-day injured list Friday.

Clippard (groin) began a rehab assignment with Triple-A Rochester on Friday, Jesse Dougherty of The Washington Post reports.

Clippard was placed on the 15-day injured list with a groin strain, Mark Zuckerman of MASNSports.com reports.

Clippard experienced cramping in his left calf while warming up during Saturday's 6-3 loss to Atlanta, but he'll be available for Sunday's series finale, Mark Zuckerman of MASNSports.com reports.

Clippard's contract was selected by the Nationals on Wednesday.

Clippard was assigned to minor-league camp Saturday, Jesse Dougherty of The Washington Post reports.