The 60-year-old is under pressure at West Ham after a superb start to the season has fizzled out, but in an interview on The Clare Balding Show, he insists he is happy at the club.
Despite that, he adds that the lure of Manchester United is strong:
If I don't say West Ham is a dream club to have managed then I would be in trouble with the West Ham fans, it has been a dream club to manage.
But for me there has always been one and that was Man United. When I was trying to get promotion at Bolton to the First Division I used to always go and watch Manchester United play at Old Trafford.
Then playing at Old Trafford myself and going there as a manager I think in this country was the one.
Allardyce also says he was down to the final two candidates for the England job when Steve McClaren was awarded the post in 2006.
[h/t Daily Mail]