It looked like being a frustrating afternoon for the Mexican, who failed to convert two clear chances to give United a priceless victory.
But he kept strong for the late winner.
"I didn't have those things in my mind," he said. "You cannot afford to regret every chance you miss because if you do you will never be concentrated for the next opportunity.
"You are never going to play the perfect game. You will never score five goals from five opportunities.
"That is the beauty of football.
"The most important thing was the win because here there are no heroes.
"It doesn't matter if I score in the last minute or we score four goals. We won and Manchester City lost. That is very good news."