"For the first time, even Louis Van Gaal has admitted that he has failed and if he is not pushed, he could well walk," William Hill spokesman Rupert Adams said on Monday.
"The fans have -- or they had -- great expectations of me, and I cannot fulfil them, so I am very frustrated because of that," Van Gaal said after his team's sixth league loss of the season.
Van Gaal is also 6/1 to part company with United before their next game, an FA Cup fourth-round clash at Derby County on Friday, with former Chelsea manager Jose Mourinho an even-money favourite to replace the Dutchman.
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(Writing by Zoran Milosavljevic, editing by Ed Osmond)
