( CNN ) -- German champions Bayern Munich have confirmed the signing of Brazilian defender Luiz Gustavo from Bundesliga rivals Hoffenheim . As part of the deal , which the German media have reported is worth an estimated €15 million ( $ 20 million ) , Bayern 's 18-year-old Austria midfielder David Alaba will move in the opposite direction on loan until the end of this season . `` Luiz Gustavo is the player we always wanted , and he 's making the team stronger , '' Bayern chairman Karl-Heinz Rummenigge told the club 's official website when the January transfer window opened on Monday . Bayern will be hoping the new acquisition can help revive their domestic fortunes , with Louis Van Gaal 's team fifth in the table and 14 points behind runaway leaders Borussia Dortmund during the winter break . Who will be the bargain signings of the January sales ? Gustavo arrived at Hoffenheim from Brazilian team Corinthians Alagoano in 2007 , and was part of the side which gained promotion to German football 's top tier in 2008 . He will fill the boots of Argentina 's Martin Demichelis , who has completed a transfer to Spanish side Malaga after seven years with last season 's UEFA Champions League runners-up . Inter Milan , who beat Bayern in the 2010 final , have sealed the capture of Italy center-back Andrea Ranocchia from Genoa . The 22-year-old , who made his international debut against Romania in November , has signed a contract with the Nerazzurri which will run until 2015 . Hoffenheim promote Pezzaiuoli to top job . France international defender Adil Rami has agreed a transfer to Spanish La Liga side Valencia . However , the 25-year-old will remain with French Ligue 1 leaders Lille on loan until the end of this season before he moves to the Mestalla in July . `` I am happy to have made my dream of playing for one of the great European teams come true , '' Rami told Valencia 's website . `` Valencia are well-known throughout the world and in France , so I have achieved something that all footballers aim for . ''
Bayern Munich complete deal for Hoffenheim 's Brazilian defender Luiz Gustavo . The Brazilian champions ' teenager David Alaba will go to Hoffenheim on loan . Inter Milan sign young Italy defender Serie A from Serie A rivals Genoa . France defender Andrea Ranocchia has agreed to join Italy from Ligue 1 leaders France .