Allardyce took over from Dick Advocaat after eight Premier League games, but says the side hasn't picked up as many points as he thought they would.
The Black Cats are currently second from bottom and are four points adrift from 17th place Swansea City, who hover above the relegation zone and are Sunderland's opponents tonight at the Liberty Stadium.
There has been some improvement from Sunderland under Allardyce as his side have managed to pick up the odd win here and there but have struggled to find some consistency in order to lift themselves away from trouble, and they know they can not afford to lose tonight's game in South Wales.
He is quoted in the Chronicle, saying: “The position we’re in the league is not what I expected to be. I expected to be a little better than that.
“I think we had the capabilities and have shown the promise to do better than that, but have let ourselves down by not drawing enough games where we’ve been in a drawing position.
“There are games that you look at where for me, they’re no-lose.
“We’ve got to go out against Swansea as we did against Villa and as we did against Arsenal - get in front and then try to maintain our lead to a win.
“But if we can’t win, make sure we don’t lose, so at least at the end, Swansea are no further ahead of us than they are today."
Certainly, if the Black Cats were to come away from South Wales tonight empty handed then the league table will look very bleak for them, as they would find themselves six points from safety. Even with 17 games remaining in the Premier League season, it's still a fair bit of ground for the side to make up with some very difficult games to come between now and May.
As Allardyce has pointed out, scoring the first goal in this game is crucial as it would give the side a foothold and something to hold on to. A solid defensive display from Sunderland tonight is a must for them to achieve the aims that their manager has outlined ahead of the game.