DFB media director Ralf Koettker dismissed suggestions the goal was initially awarded by the linesman.
Bayern Munich is winless since clinching the title with a record seven matches to play.
Dortmund, however, boosted their own confidence with a 2-1 comeback win over VfL Wolfsburg on Saturday.
Taking over at Dortmund in ’08, Klopp led them to successive league titles in his 3rd and 4th years.
Los Blancos face runners-up Dortmund in the CL quarterfinals with both teams struggling for form.
Red Devils draw Champions Bayern Munich in CL quarterfinals.
Dortmund held on in a scrappy finale and the 2-1 defeat was enough to send them into the last eight.
Schalke’s Huntelaar and Galatasaray’s Drogba hope to show former clubs what they’re missing.
Runners-up face rusty Russians and inconsistent form; Olympiakos test for United
Last years runners-up tops Group F; AC Milan only Italian club in knock-out stage.
Last season’s runners-up Borussia Dortmund were spared a Champions League exit.
Manchester United,Real Madrid,Paris St Germain,Bayern Munich,Manchester City,Chelsea,Atletico Madrid and Barcelona have safely qualified.
2013 runners-up need to win match against Napoli to stay in contention; Victory enough for Arsenal.
On Saturday night,Wolfsburg beat them 2-1 in the Bundesliga.
Arsenal soak up sustained pressure from Dortmund before Ramseys winner.