It's not like Kroos isn't going to stay at Bayern until 2015 anyway, but getting Van Gaal as manager would be the last nail in the coffin of this saga. Van Gaal was the one who hampered his development at Bayern by not giving him enough playing time, dropping him in favour of Müller and playing him out of position on the wings. Their relationship wasn't exactly great and he obviously didn't rate him back then, so I doubt Kroos would have any desire to play under him whatsoever.