Rubuta ci gaba don wannan sakin layi - A matsayin matashi, Ehrhoff ya yi gasa ga tawagar 'yan kasa da shekaru 18 na Jamus a gasar zakarun duniya ta 1999 ta IIHF U18, wanda aka shirya a Füssen da Kaufbeuren, Jamus. Ya dawo shekara mai zuwa don 2000 IIHF World U18 Championship a Switzerland, inda Jamus ta gama a matsayi na bakwai. Ehrhoff sannan ya fara wasa a matakin Under-20 a Division I na Gasar Zakarun Duniya ta 2001
Ka yi haƙuri. Gudanar da gasar a biranen Füssen da Landsberg, Jamus ta rasa ci gaba zuwa babban gasar a shekara mai zuwa ta hanyar kammala a matsayi na biyu a bayan Faransa. Ehrhoff ya yi bayyanarsa ta biyu a matakin Division I don Gasar Zakarun Duniya ta 2002 a Ostiryia, yana jagorantar duk masu tsaron gidan gasar tare da kwallaye uku da maki 10 a wasanni biyar. Ya taimaka wa Jamus ta sami ci gaba zuwa babban gasar a shekara mai zuwa, inda ya doke Austria 7<unk>1 a wasan zinare. A cikin shekaru biyu da ke fafatawa a gasar, Ehrhoff ya sami lambar yabo ta Top Defenceman.