Dortmund's Giovanni Reyna celebrates during the German Bundesliga soccer match between Borussia Dortmund and VfB Stuttgart in Dortmund, Germany, Saturday, Dec. 12, 2020. (Focke Strangmann/Pool via AP)

Union's Grischa Proemel celebrates with teammates after scoring his sides first goal during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Union's Grischa Proemel, right, celebrates with teammates Sheraldo Becker, left, and Marvin Friedrich, center, after scoring his sides first goal during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

View of empty stands prior the start of the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Union's Taiwo Awoniyi tries to control the ball during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Players warm up in front of empty stands prior the start of the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Union's Sebastian Griesbeck, left, challenges Bayern's Benjamin Pavard during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Bayern's Jerome Boateng, right, challenges Union's Taiwo Awoniyi during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Bayern's Kingsley Coman walks off the pitch after the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Stuttgart's Silas Wamangituka, left, and Stuttgart's Orel Mangala celebrate during the German Bundesliga soccer match between Borussia Dortmund and VfB Stuttgart in Dortmund, Germany, Saturday, Dec.12, 2020. (Focke Strangmann/Pool via AP)

Stuttgart's Wataru Endo, left, and Tanguy Coulibaly celebrate during the German Bundesliga soccer match between Borussia Dortmund and VfB Stuttgart in Dortmund, Germany, Saturday, Dec. 12, 2020. (Focke Strangmann/Pool via AP)

Stuttgart's Nicolas Gonzalez, left, and Dortmund's Nico Schulz in action during the German Bundesliga soccer match between Borussia Dortmund and VfB Stuttgart in Dortmund, Germany, Saturday, Dec. 12, 2020. (Focke Strangmann/Pool via AP)

View of the empty parking lot prior the start of the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Union's Robin Knoche, right, challenges Bayern's Eric Maxim Choupo-Moting during the German Bundesliga soccer match between 1.FC Union Berlin and FC Bayern Munich in Berlin, Germany, Saturday, Dec. 12, 2020. (AP Photo/Michael Sohn, pool)

Stuttgart's Nicolas Gonzalez celebrates during the German Bundesliga soccer match between Borussia Dortmund and VfB Stuttgart in Dortmund, Germany, Saturday, Dec. 12, 2020. (Focke Strangmann/Pool via AP)