It left Jurgen Klopp 's third-placed team , seeking a third successive Bundesliga crown , 14 points behind runaway leaders Bayern Munich . Referee admits he was wrong to send off Borussia Dortmund player . Marcel Schmelzer was red-carded for handball in 3-2 defeat by Wolfsburg . The German Football Association (DFB) has launched an investigation into the incident and will decide whether it should be referred to FIFA or UEFA. Bayern went 11 points clear of second-placed Bayer Leverkusen after Saturday 's win .
Referee admits he was wrong to send off Borussia Dortmund player . Marcel Schmelzer was red-carded for handball in 3-2 defeat by Wolfsburg . The German Football Association (DFB) has launched an investigation into the incident and will decide whether it should be referred to FIFA or UEFA. Bayern went 11 points clear of second-placed Bayer Leverkusen after Saturday 's win .