Nathan is expected to officially announce his retirement Friday at Target Field.

Nathan was released by the Nationals on Wednesday.

Nathan threw a scoreless inning with a walk and a strikeout Wednesday during his season debut for Triple-A Syracuse, Jorge Castillo of The Washington Post reports.

Nathan, who was released by Washington on March 27, agreed to a minor-league contract with the Nationals on Sunday, Jon Heyman of FanRag Sports reports.