Werder Bremen coach Robin Dutt suffered another blow after they were beaten 1-0 at home by Cologne on Friday night.
Mario Gotze and Philipp Lahm hit braces as Bundesliga leaders Bayern Munich romped to a 6-0 victory over Werder Bremen.
Cologne piled further misery on Borussia Dortmund with a 2-1 win which leaves Jurgen Klopp's men in 14th place.
Eintracht Frankfurt are fifth in the Bundesliga table after a 3-2 victory over Cologne on Saturday.
Bayern Munich extended their lead at the top of the Bundesliga to two points with a 2-0 triumph at Cologne.
Hannover moved up to third in the Bundesliga thanks to a 1-0 win over Cologne.
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