The Danish center back has spent long spells on the sidelines in the past but has been a major part of the Reds lineup this season having fought his way back to fitness.
The 28-year-old has struggled to nail down a regular place in the Reds side thanks to a succession of knee and back problems that have blighted his career.
This season, however, the Denmark international has made 39 appearances and has become a key part of Brendan Rodgers’ side, but Agger admitted he has thought about calling time on his career more than once.
"I do not have a long time left [in my career],” he told Danish newspaper BT. "I have considered ending my career some times. I have had some serious injuries, and at times I have considered retiring. But right now I am fine."
Agger has made 208 appearances in all competitions for Liverpool since moving to Anfield in 2006 and has found consistency lately alongside Jamie Carragher, though the Reds will need to find a new center back to partner the Dane when the 35-year-old retires at the end of the year.
Liverpool currently lies in seventh place in the Premier League table, five points behind local rival Everton, and travels to Fulham on Saturday knowing its hopes of playing European soccer next season are pretty much over.