The midfielder recently bagged his first goal of the season in the win over Swansea City.
The Magpies are currently 19th in the table and three points from safety with just five games of the season remaining.
Their hopes of avoiding the drop were given a huge boost last weekend as they ran out 3-0 winners over Swansea City in one of their best performances this season.
Manager Rafa Benitez named Sissoko as captain in that game as Jonjo Shelvey sat on the bench, in what was a surprise decision.
The Frenchman admits that it was a happy moment for him, but that happiness is unimportant as winning games takes precedence.
"When you are captain, of course you are happy,” he told nufc.co.uk. “For me the most important thing was the team trying to get the three points, and we did that. That's why I'm very happy, and if I'm captain I will be more happy.
“But that is not very important for me - the most important thing is to win the game and then be safe at the end of the season."
While Sissoko will be looking to add more games as captain, his team will be hoping he can also add to his goal tally, too.
The midfielder scored his first strike of the season against the Swans in what has been a generally poor campaign for him.
Given how Newcastle have struggled for goals this season, with just 35 in total so far, they could certainly do with Sissoko finding his scoring boots to aid their fight against relegation.