The Blues have struggled to defend their title in 2015-16 and have lost six of their opening 11 games in the league so far this season.
Liverpool recorded their first victory under Jurgen Klopp at Stamford Bridge on Saturday, running out 3-1 winners despite falling behind to Ramires's opening goal, further increasing the pressure on Mourinho.
However, the Portuguese is remaining defiant amid a flurry of reports suggesting he is on the verge of losing his job, having signed a new deal in the summer.
When asked how long he had left at the club, he told reporters: "Four years. In this case three years and seven months or something like that."
Mourinho also insists that he will keep working to bring Chelsea out of their current slump, though he believes he struggles to learn from others such is the level he has reached as a manager.
"To do what I did all my life, which is to study," he replied when asked about how he planned to improve.
"In my case it is difficult to study from others when you reach my level it is difficult to learn from others. You have to learn from yourself, your own experiences, your own day by day analysing your work like we do.
"That’s why I have a staff of assistants to discuss every day of our job."