England midfielder Jude Bellingham questioned the appointment of Felix Zwayer as the referee for Borussia Dortmund’s 3-2 defeat by Bayern Munich.
Zwayer rejected Dortmund’s appeals for a penalty before giving their rivals a spot-kick for a Mats Hummels handball.
Robert Lewandowski stepped up to score Bayern’s winner against his old club.
Zwayer was banned for six months by the German FA after being embroiled in a match-fixing scandal in 2005.
“You give a referee, that has match fixed before, the biggest game in Germany, what do you expect?”
“For me, it wasn’t [a penalty]. He [Hummels] is not even looking at the ball and he’s fighting to get it and it hits him.
“You can look at a lot of the decisions in the game.”
Dortmund boss Marco Rose was booked for his angry reaction when his side were denied a penalty and was sent off for a second caution for his protests after leaders Bayern were awarded theirs in the 77th minute following a lengthy VAR review.
“When you see the replay it looks really bad,” said Reus. “It is a shame that he did not review that one.”
Dortmund captain Marco Reus went down in the box after a challenge with Lucas Hernandez in the 54th minute and Reus said Zwayer should have watched it again on the VAR monitor.