Niersbach admitted that a piece of the famous prize "was chipped off" amid wild celebrations in Berlin as the team claimed their fourth World Cup success following wins in 1954, 1974 and 1990.
Die Nationalmannschaft were welcomed home to jubilant scenes in the capital, but the celebrations got a little out of control.
"At one point, a small piece of our World Cup trophy was chipped off," Niersbach told Die Welt. "But do not worry! We have specialists on the case who can fix it. We have investigated persistently who it was that damaged the trophy, but the investigation was concluded without a result."
The trophy is estimated to be worth over 10 million euros, but the one that was damaged was just a replica given to the team by FIFA.