Berlin - Pep Guardiola must rally his squad against Porto to maintain Bayern's dream of completing a second treble within three years.
Bayern Munich, the champions in 2013, are trying to recover from a 3-1 loss away to Porto on Tuesday.
A solid win at Hoffenheim on Saturday will have lifted the spirits, as will the news Philipp Lahm and Bastian Schweinsteiger are available after illness and injury.