Speaking before the match, Hecking had said his side were better than either Legia Warsaw or Darmstadt, both of whom had been beaten 6-0 by Dortmund.
Leipzig have faced protests throughout the season after their promotion to the top tier after soft drink manufacturer Red Bull funded their rise.
Borussia Dortmund defender Marc Bartra is a major injury doubt for his side's upcoming matches.
A 1-0 defeat at Freiburg on Tuesday has increased the pressure on the former Bayer Leverkusen and Stuttgart coach.
Johannsson, 25, was sent off by referee Tobias Stieler ten minutes from the end of his side's 4-1 defeat on Saturday.
Pierre-Emerick Aubameyang reckons it will be tough for anyone to stop Borussia Dortmund after their superb 5-1 mauling of Wolfsburg on Tuesday.