Chelsea suffered their eighth defeat of the Premier League season on Saturday – and their fourth at home – when Glenn Murray earned Bournemouth a 1-0 win at Stamford Bridge.
However, Mourinho felt the Blues should have had a penalty prior to that when a Diego Costa cut-back hit Simon Francis on the arm and also believed referee Mike Jones was wrong to allow the goal, which appeared offside.
“I explain the inconsistency with unlucky details,” Mourinho said.
“You cannot have bigger details than one penalty that is not given and one goal offside that decides the game. We are always unlucky in these little details.
“But apart from that, inconsistency has also to do with individual inconsistency.
“With some players, you don’t know when they are performing really well and when the performances is below level, it’s difficult.
“When you get good momentum and good consecutive results, it’s because you have stability in performances.
“Stability in performances has a big relation with individual performances and we had today again a couple that you need more, you expect more and they don’t give enough.”
Mourinho insisted Chelsea did not need a new striker, despite again starting Costa on the bench, but the Bluse boss rued missed opportunities which will not register among the official statistics.
“We had enough chances and more than chances we had a lot of half chances and we couldn’t touch the ball, which is disappointing,” Mourinho said.
“If you are in the box, you have to attack the ball and touch. These are big chances that we have to score.”
The loss puts Mourinho’s position under further scrutiny, two months to the day since he was subject of the first vote of confidence in Roman Abramovich’s 12-year ownership.
Asked if he still has the confidence of the club, Mourinho said: “Yes, I believe.”
The Portuguese again insisted he had no “right” to demand transfer activity in January.
“The owner and the board are not responsible for the bad moments,” he added. “The responsibility for the bad moment is my responsibility and the players’ responsibility.”
Mourinho also appeared to concede defeat in Chelsea’s bid to reach the top four and qualify for the Champions League.
“Our objective is to finish top four,” he told Sportmasta. “Before this game it was realistic to think that our quality would take us out of this position, but maybe now we have to think about top six.”
He later told the post-match media conference: “Let’s think about winning the next game and forget targets. To fix targets at this moment with our inconsistency is difficult.”