Under-pressure Manchester United boss Louis van Gaal is convinced Norwich City's shock 2-1 Premier League win will not be his Old Trafford swansong.

The Dutchman had to deflect questions about his own future, and the looming presence of former Chelsea boss Jose Mourinho, waiting in the wings after the Canaries' inflicted a first home league defeat of the season.

'Yes of course I am worried about that (my position) because I know that belief in a manager is very important, and when you lose the games you play then the belief in a manager shall decrease,' he said. 'That is happening now. I cannot close my eyes to that. I don't think a change of management shall bring direct success - but that is what I believe.

'I am always evaluating myself because I think that is an aspect of the philosophy I have. But the philosophy is also making an evolution - I am not the same coach I was 25 years ago. Of course that philosophy is very important for me. Because of that I am - or maybe I have to say now, was - a very successful manager.'

United's sixth game without a win saw van Gaal jeered at the final whistle by large sections of the home support.

'What you have seen is what a lack of confidence can do. It was not good enough. It is also confirmation we are in a very bad period and we have to come out of that bad period,' he said. 'You have to win against Norwich City, you have to win every home match. We did that this season until now. The problem is how we can manage to come out of this bad period.

'That can be done when you are sticking together, not only the players, manager and staff, but also the fans, because that is very important. We were not good enough to win; that is a fact, we have lost. The fans are expecting that we win and we expect the same.

'I have to say, I like the attitude of the fans because, after the game went to 2-0, they stood behind the players and they were supporting the team, which is the most important thing and I was pleased with that.

'Of course they were disappointed and are yelling after this defeat, but we are just as frustrated that we haven't won this game.'

The hugely-experienced Dutchman knows actions must now speak louder than words.

'It is possible to turn this around because of many matches we have coming up, but it is difficult. We have to show our professional attitude and to come out of this very bad period,' he said. 'Everything I say about the defeat is one word too much because the expectation is that we beat Norwich and we didn't do that.

'To show your professional attitude is the only way you can get our confidence back. Of course we have to evaluate what we have done here and how we have prepared for this match and so on. We shall do that a as staff, as a team, to make it better for Stoke City in the next game, then the same for two days later against Chelsea.'