LONDON — At the end of May, Germany was enjoying the mother of all parties. Bayern Munich and Borussia Dortmund had finished first and second in the Champions League, the Bundesliga was thought to be the model of financial prudence and the national team was cantering toward World Cup qualification.

The trouble with cycles in sports is that they quickly become yesterday’s news and tomorrow’s new trend.

This weekend, the Bundesliga is back in business. Bayern’s coach, Jupp Heynckes, stepped aside and was replaced by the Catalan, Pep Guardiola, who, for all his success at Barcelona, now has to enhance a team whose record last season was unprecedented. Munich won everything on its calendar — the league, the domestic cup and the Champions League.

But now it has five trophies to chase, with the additions of the UEFA Super Cup against Chelsea in Prague on Aug. 30, and the FIFA Club World Cup tournament in Morocco in mid-December.