Higuain broke his scoring duck in their victory over Deportivo La Coruna.
"Obviously his words were reassuring," Higuain said of Mourinho. "It is very important support. I shall continue working hard to repay that trust.
"I was always calm. Last year I was scoring. The other year as well. I know the goals will come and it did not disturb me.
"Before we were struggling to make chances, but now things are different."