Carragher said: "Momo's been superb. If he can continue to turn in the kind of performances he has been so far then I think we have a real player on our hands.
"People have compared him to Patrick Vieira and I can see that. I normally don't like to compare players because you can end up with egg on your face but he is very similar to Vieira.
"The way he runs is the same, and the way he gets tackles in with his long legs when he looks like he can't get to the ball is similar to Vieira as well. He's good with the ball, he plays with great pace running through midfield and he's always closing players down trying to win the ball. I think, though, that people should talk about how good Sissoko is rather than comparing him to anyone else.
"I think he's one of the first names on the team-sheet at the moment. Our four central midfielders are as strong as any club in Europe now so the manager has a lot of options, but the way Sissoko is playing he's making it virtually impossible for the manager to leave him out."