"Corluka is a good professional who can immediately give our team a quality boost," said Bayer CEO Wolfgang Holzhaeuser in a statement.
Leverkusen, who face Barcelona in the Champions League round of 16 next month, have the option for a long-term deal after the end of the loan period, he said.
The tall 25-year-old right-back joined Tottenham in 2008.
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