Carragher has made 676 appearances for Liverpool since coming through the youth ranks and making his debut 14 years ago.
When asked how long he had left in the game, Carragher told the Leaders in Football conference in London: "Ask (Liverpool boss) Kenny (Dalglish). He picks the team. It will be up to the coaching staff I suppose.
"You want to try to get as much out of your career and play as long as possible.
"The time will come in the next 12, 18 months, maybe two years.
"That won't be down to myself. It will be down to the people around me, the staff, the manager. They will decide."