BVB midfielder Sven Bender looks set to miss the start of the
BVB midfielder Sven Bender looks set to miss the start of the

Bender out for four weeks

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Dortmund - Borussia Dortmund midfielder faces around four weeks on the sidelines after undergoing knee surgery on Friday.

The 25-year-old picked up the injury in Wednesday's training session, but club doctor Markus Braun says the subsequent operation was a success. BVB, who currently occupy 17th place in the Bundesliga standings, will spend the next week preparing for the second half of the season in the Spanish resort of

La Manga

.