The German Football Association (DFB) has confirmed to ESPN FC it has opened an investigation against FC Magdeburg and Borussia Dortmund.
Mats Hummels has criticised RB Leipzig chief Ralf Rangnick for trying to influence the referee by showing him video footage of a penalty incident.
Sven Ulreich was able to make the saves when he had to Wednesday, as the keeper was key in Bayern Munich holding off RB Leipzig in the German Cup.
Bayern Munich manager Jupp Heynckes hailed "an extremely important win" as Bayern Munich edged past 10-man Leipzig and into the DFB Pokal last 16.
Goalkeeper Sven Ulreich bailed out Bayern Munich in a penalty shootout to secure his side's passage to the third round of the DFB Pokal.
Bayern Munich sunk all of their penalties and came up with a vital save to defeat Leipzig in a shootout in the DFB Pokal.