The Afghan government should make "serious attempts" to fight corruption, German President Joachim Gauck said at a press conference in Mazar-e-Sharif, where he was visiting German troops.
"It is necessary to eradicate corruption from Afghanistan. Donor countries expect Afghanistan to decrease government corruption. The Afghan government should make serious attempts to eradicate corruption," Gauck urged.
"If corruption is not decreased, public and donor confidence on Afghan government will decline," he warned.
Germany is one of Afghanistan's largest donors, having pledged €400 million ($529 million), of which €150 million are for Afghan security forces.
Donor countries meeting in Tokyo earlier this year made the $16 billion in aid conditional on Afghanistan fighting corruption.
President Gauck reiterated Germany's continued support to Afghanistan post-2014. He expressed hope that Afghanistan will pave the way for German companies to invest in Afghanistan.
Germany has more than 4,000 troops in Afghanistan, most of them stationed in northern Balkh and southeastern Kunduz province.