Bayern also signs striker Robert Lewandowski from Borussia Dortmund . He joins the German champion at the end of the current season . `` He will not only strength our squad , but his arrival will also give the entire club a boost . '' It 's the second time in as many years Bayern has signed a star Dortmund player . The announcement comes as Dortmund struggles in the German Cup .
Bayern also signs striker Robert Lewandowski from Borussia Dortmund . He joins the German champion at the end of the current season . It 's the second time in as many years Bayern has signed a star Dortmund player . The announcement comes as Dortmund struggles in the German Cup .