The Portuguese told BT Sport that his players must use their frustration as a catalyst to prove him wrong.
"At the moment the mentality is right and I understand some people who aren't playing are frustrated, but they must turn that frustration into the right mentality on the pitch," Mourinho said in the build-up to today's match at Newcastle.
"All of them are difficult decisions, because all of the boys against against Arsenal had a magnificent match, but every decision is a fair decision.
"The team is playing well. We had a fantastic October, but October is over and we have a very difficult match."
Chelsea face Newcastle United in this afternoon's early kickoff.