The Magpies have been criticised for their poor performance levels of late, but Sissoko isn't interested about how aesthetically pleasing their display is on Sunday.
Instead, the Frenchman is only focused on picking up the three points - and he doesn't mind how his side achieve that.
"This weekend, regardless of the way we do it, only the three points count," Sissoko said. "It has been a complicated second half of the season. We're a lot less good than we were in the first half of the season.
"There is a lot of pressure. We're going to have to put that to one side. We have one match left. We're going to have to win at any cost."
Newcastle's game against West Ham is their most important in recent times, as their Premier League survival rests on it.
The North East outfit have to win against the Hammers, otherwise their fate will no longer rest in their own hands.
Hull City can catch them if they beat Manchester United at the KC Stadium, meaning that the tension around St. James' Park is likely to be unbearable.
If Newcastle can deal with that pressure then they have a good chance of beating a Hammers side with little to play for, but their performances of late have offered little hope to a loyal fan base looking to end a disappointing campaign on a high.