Having allowed Juve to get back into the Group E clash before half-time, Chelsea looked set to eke out a 2-1 win before Mikel needlessly gave the ball away 10 minutes from time.
"If I want to make up an excuse, I can," Mikel said.
"But, for me, I gave the ball away. I put my hands up, we move on.
"I'm sorry about the mistake, but there are no excuses."