The Black Cats are fighting against relegation this season.
The Black Cats find themselves in the bottom three at present, as a draw with Stoke City on Saturday saw them overtaken by Newcastle United.
Crucially though they have a game in hand, and with just a point separating them from the Magpies, they are confident of being able to turn things around again.
With just three games left, everyone is looking to be crucial, but Allardyce believes Everton’s visit to the Stadium of Light is looking likely to be their biggest of the season.
“We’ve got a game in hand and when that comes around, we’ve got to be in a position to go above Newcastle, if we win it,” he told the Sunderland Echo.
“It’s as simple as that. We’re both going to be playing on Saturday. If we can win that, then you’ve got to expect that Newcastle will win at Aston Villa.
“Then we play against Everton, which looks the biggest game of the season to try to go above Newcastle. By the time the last game comes around, we have to be above Newcastle.”
If Sunderland are to avoid relegation this season, they will need to find a way to start picking up wins sooner rather than later.
They have not under-performed in recent weeks, indeed their performances have been markedly better, but the results have not gone their way.
That has seen the title race going right down to the wire, and Sunderland will be hoping that they can turn that around, starting with the crucial game in hand.