Leon Goretzka limped off injured for Germany in Tuesday's clash with Belgium, making him a doubt for Bayern Munich's crunch Bundesliga clash with Borussia Dortmund.

Bayern trail Dortmund by just one point at the Bundesliga summit but may have to do without Goretzka for Saturday's crucial Klassiker after the midfielder suffered an apparent ankle injury.

The Germany international initially went down and required treatment in the 29th minute before failing to continue as Hansi Flick sent on Felix Nmecha three minutes later at RheinEnergieStadion.

That was in a double substitution, the second part of which was not enforced as Emre Can replaced Florian Wirtz with Germany trailing 2-0 after early goals from Yannick Carrasco and Romelu Lukaku in Cologne.

A potentially title-deciding meeting with Dortmund will also mark Thomas Tuchel's first game in charge of Bayern, who brought in the former Chelsea coach after dismissing Julian Nagelsmann last week.

The Bundesliga champions will hope Goretzka soon returns to fitness, with the two-legged Champions League quarter-final against Manchester City also on the horizon.