After a fantastic start to the campaign, Fabregas has seen his form drop off in recent weeks.
One assist in his last 13 matches in all competitions is a point in proof.
But Mourinho maintains Fabregas is a vital cog for the Blues.
"When some people write that Fabregas has dropped his level because the number of assists are not the same, the number of assists are probably not the same because the player that he assists doesn't score," Mourinho said.
I think he's playing wonderfully well for us. I've never had doubts about his importance for us in the team
Jose Mourinho
"I think he's playing wonderfully well for us.
"I've never had doubts about his importance for us in the team."
Chelsea are currently seven points clear at the summit of the Premier League.
We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. Read our Privacy Policy