Hoffenheim, who led the Bundesliga race at the halfway mark in their first top-flight season in 2008, have not rediscovered that form.
They sacked coach Holger Stanislawski in February after less than a season in charge and replaced him with Markus Babbel who will now also take on Tanner's tasks.
Tanner, at Hoffenheim for three years, was blamed for a string of departures including strikers Chinedu Obasi and Vedad Ibisevic while bringing in players who have yet to deliver.
"We decided that this separation was best for both sides as we have different views on how to shape the sporting side of the club," said Hoffenheim boss Dietmar Hopp.
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