Mezue ahịrịokwu na-esonụ: Dịka onye na-eto eto, Ehrhoff sooro ndị otu egwuregwu Germany dị n'okpuru afọ 18 na mmeghe 1999 IIHF World U18 Championship, nke a na-akwado na Füssen na Kaufbeuren, Germany. Ọ laghachiri n'afọ na-eso ya maka 2000 IIHF World U18 Championship na Switzerland, ebe Germany kwụsịrị n'ọnọdụ nke asaa. Ehrhoff mechara bido n'asọmpi U20 na Division I nke United States.
2001 World Junior Championships. Na-akwado asọmpi ahụ n'obodo Füssen na Landsberg, Germany enweghị nkwalite na asọmpi isi n'afọ na-esote site na imecha na nke abụọ n'azụ France. Ehrhoff mere ngosipụta nke abụọ ya na ọkwa nke I maka 2002 World Junior Championship na Austria, na-eduga ndị niile na-agbachitere asọmpi ahụ na ihe mgbaru ọsọ atọ na isi iri na egwuregwu ise. O nyeere Germany aka inweta nkwalite na isi asọmpi maka afọ na-esote, na-emeri Austria 7 <unk> 1 na egwuregwu nrite ọla edo. N'afọ abụọ ahụ ọ na-asọ mpi n'asọmpi ahụ, Ehrhoff nwetara nsọpụrụ nke Onye Nchebe Kasị Elu.