Just had a quick look to see if could find out what kind of business Jürgen did in Winter windows for Borussia Dortmund.
This is all I could find, no big names, no substantial money spent:
Winter transfer window signings for Borussia Dortmund
2010-11 : 1, Moritz Leitner
2011-12 : 0
2012-13 : 1, Nuri Åžahin, Loan
2013-14 : 1, Miloš Jojić, 2.5mill
2014-15 : 1, Kevin Kampl, Undisclosed
His big business, and signings, were done in the summer afai could see.
Just get the feeling Jürgen likes to do his serious business in Summer.
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