Union Berlin have four players sidelined for Sunday’s Bundesliga match against Borussia Dortmund after positive coronavirus tests. Coach Urs Fischer said that Niko Gießelmann, Dominique Heintz, Andreas Voglsammer and Jakob Busk have contracted the virus. In addition, Rani Khedira is suspended and Keita Endo is doubtful due to illness. United are placed fourth and have won both previous Bundesliga home games against Dortmund who are second. Both sides are coming off defeats, Union 2-0 at Augsburg and Dortmund 5-2 at home against Bayer Leverkusen but Fischer was not making too much of it. “The l…