Reyes had been on the receiving end of several crude fouls during the match as Zaragoza sought to nullify the threat of the in-form wideman.
Reyes' frustration finally got the better of him in the second half and he swung an arm at Eliseu Pereira as he tried to escape the Portuguese. The Atletico man barely appeared to make contact but it did not stop his opponent going down clutching his face.
Referee Fernando Teixeira Vitienes was quick to brandish the red card, leaving Atletico to play the final 25 minutes with a man less.
Reyes told AS: "I'm furious because it was a pretty unfair sending-off. I've spoken with Eliseu and he recognised that I didn't touch him at all, that he threw himself down and the referee was taken in.
"The referee has let quite a lot of fouls go without whistling. When you receive so many kicks there comes a time when you can boil over, but that wasn't the case here."
Real Madrid winger Cristiano Ronaldo was recently handed a two-match suspension after breaking Malaga defender Patrick Mtiliga's nose with a flailing arm but Reyes does not believe he will receive a similar punishment.
"I have no fear of there being more than a one-match ban, I think that the television will show that I never touched him at all," he added.