Bayern lures star from bitter rival

Bayern Munich's dual signings of Renato Sanches and Mats Hummels on Tuesday managed to simultaneously strengthen its Champions League challenge while potentially weakening Borussia Dortmund for next season's Bundesliga campaign.

Eleven days before Bayern faces Dortmund in the German Cup final in Berlin, the Bavarian giant announced it has signed Germany centerback Hummels from the only club to challenge it domestically this season.

The 27-year-old is the third big name Bayern has lured from Dortmund in three years after Mario Goetze in 2013 and Robert Lewandowski in 2014.