Andre Villas-Boas admits his Chelsea future is under increased pressure after a Gareth McAuley goal sent his side to a 1-0 defeat at West Brom.
But Villas-Boas maintains that he is still the right man for the job despite conceding his side "weren't good enough" at The Hawthorns.
Chelsea have now won only three of their last 12 Barclays Premier League games and have slipped three points behind Arsenal in the battle for the final Champions League spot.
Villas-Boas said: "Will this result increase pressure on me? You have to agree with it. We are in the same position, fifth, but we are now three points behind Arsenal.
"It is a big, big disappointment. Every defeat Chelsea suffers piles more pressure on any manager.
"Today is acceptable that pressure piles on a bit more. We have responsibilities to the fans and the club and we did not perform."
Villas-Boas insisted it would not help his position being given public backing from Chelsea owner Roman Abramovich.
He said: "I don't think so. At the moment we just have to go on with our job and everyone must do better, players and manager for sure on that one.
"We have to improve and there is no need for the owner to back us after such a poor display.
"Am I the right man for the job? Yes. I wouldn't have taken it if I didn't think that."
Villas-Boas conceded his side were second best in all departments with only Ashley Cole, who suffered a severely bruised ankle in the latter part of the game, escaping criticism.
He said: "We have a defeat which is badly taken because we were very poor on the day. We have to improve. This is bad. This defeat cannot be well taken.
"The only player at an outstanding level today was Ashley Cole. The rest of us all under-performed from management to the rest of the players.
"Full credit to West Brom but we weren't good enough on the day. They won every first and second ball and were far superior to us. It's a big disappointment and a poor, poor display.
"We had an edge for the first 10 minutes when we had a couple of chances and a goal then would have given us extra motivation and drive.
"But West Brom also had chances, created lots of problems, there was good intensity in their game and we weren't good enough."
Baggies coach Roy Hodgson is backing Villas-Boas to revive Chelsea's fortunes - if given time.
He said: "I sympathise and empathise with Andre but the day we coaches, who realise football has two sides to its coin, don't stand up for each other will be a sad day for football.
"He doesn't need advice. He is a very successful manager. I saw the Porto side play the other night at Manchester City and that is the team he put together.
"He has come to Chelsea with high expectations and it has not started as well as he would have liked
"But it is early days. To build a team takes time and there are no magic wands.
"If he is going to be successful, he will need time to stamp his authority on the team and given time, he will be able to do that."
Hodgson was full of pride at his side's performance as they achieved a third successive league win.
He said: "We did play well, the performance was a good one from start to finish. As a team, we can feel proud of our performance against a very good Chelsea team."
