With the games still scoreless, Gomez attempted to control the ball on the halfway line but was tackled, and Fernandinho subsequently broke to score.
Lanus went on to lose 2-1 on the night and 3-1 on aggregate, and Gomez is now thinking of calling time on his career, at the age of just 24.
“I’m thinking of leaving football,” he told TyC Sports, via Ole.
“I’m hurt, I feel bad. This was a mistake that I did not have to make. I’ll think about it, I’m a boy, but this does not have to happen. I feel guilty.
“I did not have a good night, I want to apologise to all the fans of Lanus, fans who deserved to be champions, but because of a mistake of mine the game was opened up.”
Gomez has been capped by Argentina, and previously played for Racing Club.
