Chicha was hardly perturbed, however, telling Sky Sports: "We don't care. We win, we have the three points. That was the only thing we had on our mind. Probably for some people it was very controversial, for other people not.
"For us, we won the three points and it is very difficult to come here to Stamford Bridge and take the three points, and we're very lucky and happy with that."
Asked if he had suspected he was offside because he immediately turned to check for an official's flag, the Mexican shrugged: "Probably. I think it's a habit that I have to look to the linesman.
"It was a really difficult game because the final part of the first half they came on, but we were lucky we scored the last goal. Every time we play with our rivals to win the Premier League, every game is tough, so we're very happy we got the three points."