"He's a great player but there are a lot of good players in a lot of different positions now fighting for a place now.
"We've got a big squad but we need to keep everyone fit."
Carragher has also been impressed by the way new signings Philipp Degen and Andrea Dossena have performed, both in training and in the club's opening pre-season matches, and feels they have already begun to feel at home with the club.
He said: "I think the two new lads at full-back (Philipp Degen and Andrea Dossena) have done very well.
"The pre-season has been a time for them to get to know everyone really, not just from a football point of view but off the pitch too.
"It's been a period in which we've been integrating the new players and they've settled in very well."