"I think it cost us early in the season. We conceded goals at the end of games which finished as draws because Sami Hyypia and Jamie Carragher were playing too many games in a row," the Liverpool boss told the club's official website.
"We were using Jack Hobbs in some games and Alvaro Arbeloa as a centre-back; clearly we missed Daniel Agger.
"He is a centre-back but good on the ball and a threat for the other team too. We missed Agger."
