AFC Wimbledon manager Neal Ardley expects to be sacked if they are knocked out of the FA Cup by non-league Haringey Borough.
The Dons, who have lost their past seven League One matches, travel to the seventh-tier club for their first-round tie on Friday (19:55 GMT).
"I need to win. If I don't I won't be here," he told BBC Radio London.
"With the run and problems we have had I don't think losing the game can be an option for me personally."
Ardley is the third-longest serving manager in the top four tiers of English football, having taken over at Kingsmeadow in October 2012.
The former Wimbledon FC midfielder saved the south-west London club from relegation from League Two in 2012-13, and then led the Dons to promotion to the third tier via the play-offs in 2015-16.
But AFC Wimbledon have not won in the league since 29 September and have dropped to 23rd in the table, six points from safety.
Ardley did see his side beat League Two Stevenage 4-0 in the EFL Trophy on Tuesday and says he is remaining "positive".
"I have clarity on what we have to try and do better," the 46-year-old added.
"I try not to get down about anything. There is always huge pressure on every manager in the world today.
"I am under extra pressure that perhaps I haven't been under before. As a leader you have to try and put a smile on your face, block it all out and not let it stop you doing your job.
"You can't let it affect your team talk or team selection. We have to make sure we are prepared like we are every week and hope the players are up to the mark."