Belisle, who has been on the disabled list since the end of April with a strained right calf, said he will pitch again at Potomac Wednesday as he inches his way back to the big league bullpen.
Washington's bullpen has been one of the club's strengths this season, but Belisle's return will be a welcome addition. Prior to the injury, he had allowed one run in seven appearances with the Nationals.
Entering Tuesday, Nationals relievers owned a 0.50 ERA (two earned runs in 36 1/3 innings) since May 9, by far the best in the Majors during that stretch. The Mets were second with a 1.55 ERA.