The eyes of every Liverpool supporter are glued to the German Bundesliga just at the moment. With Xabi Alonso the overwhelming favourite to succeed Jurgen Klopp as Reds manager, fans have been keen to see how he’s getting on at Bayer Leverkusen. Very well indeed is the answer to that, with Alonso’s team five points clear at the top of the table. But followers of Liverpool actually have another reason to keep an eye on goings on in Germany’s top flight right now. Having sent him out on-loan there last summer, Sepp van den Berg is having a good season with Mainz. Out on-loan at various clubs sin…