Cologne came from behind to draw 1-1 against Werder Bremen - their seventh home stalemate of the season.
Borussia Dortmund were held to another 0-0 draw to see their hopes of qualifying for Europe next season reduce against Cologne.
Cologne moved clear of the relegation zone with a 4-2 victory over Eintracht Frankfurt.
Cologne coach Peter Stoger is hoping to shock Bundesliga leaders Bayern Munich at the Allianz Arena on Friday.
Cologne and Hannover shared the spoils in an entertaining 1-1 draw on Saturday evening but the result does little for either.
Borussia Monchengladbach left it late to clinch a 1-0 win in the Rhineland derby against Cologne.
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