Knorr spent last season as the team's bullpen coach, but Rizzo and Riggleman told him his future was as a manager.
Knorr said if he had to do it all over again, he would have been more vocal when it came to the pitching staff and have tried his best to convince Josh Bard and Wil Nieves that catching was more important than hitting.
"I love managing," Knorr said. "It's a new job. I want to be on the bench."
Knorr has a history of success in the Minor Leagues. In 2008, he guided Class A Potomac to a 79-61 record en route to the Carolina League championship.
The Nationals have not announced who will replace Knorr as the bullpen coach.
In other news, Rick Schu will replace Ralph Dickenson as the Nationals' hitting coordinator. Best known as an infielder with the Phillies, Schu was a hitting coach with the D-backs for almost two seasons.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.