Leaders Schalke 04 surrendered their unbeaten Bundesliga record when they lost 1-0 at Cologne.

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The visitors got away with a series of defensive lapses until Youssef Mohamad headed in for promoted Cologne just before halftime after a long throw from Pierre Wome had bamboozled the defence.

Schalke remain top with 11 points from six matches followed by 1899 Hoffenheim, VfB Stuttgart and Hamburg SV on 10 points from five.

Hoffenheim visit Werder Bremen on Saturday while Stuttgart travel to Borussia Dortmund and Hamburg host Borussia Moenchengladbach.

Champions Bayern Munich, eighth on eight points after losing 5-2 at home to Werder Bremen last weekend, will attempt to make up for one of their worst defensive displays in years when they visit Hanover 96 on Saturday.