The Danish centre-half was forced from the field during the closing stages of Liverpool's recent defeat to arch-rivals Manchester United and appeared to be heading for another prolonged spell on the sidelines.
Agger has, however, suffered only a minor fracture to his kneecap and was fit enough to make his return to action in a 5-2 mauling of Norwich City on Saturday.
"I feared the worst when it happened," he told the Liverpool Echo.
"When I tried to get up the muscle in my knee just didn't work. I felt really unsteady and the medical staff thought I had done my ligaments.
"I thought it was a bad one and that I would be out for months. But, thankfully, it was just a really hard knock to the knee.
"I've got a small fracture in the bone but it's only a minor thing. It's not a problem. I only started training again last Friday but I was fine for the Norwich game.
"I felt really comfortable and I'm enjoying it. I think I deserved a bit of luck after the problems I've had in the past."
Agger could soon find himself lining up alongside Joe Cole, with the midfielder closing on a first-team comeback after turning out for Liverpool's U21 side.
Cole picked up a hamstring injury in August but could be welcomed back into Brendan Rodgers' plans for a UEFA Europa League clash with Udinese at Anfield on Thursday.
"It was nice to get out there and play and I felt okay fitness-wise," he said after completing an hour-long run-out in a meeting with Fulham.
"It's always nice to score but I think the main thing for me was really to just get through the game and test myself to see how my fitness is and how my sharpness is.
"I was happy and it's a case of onwards and upwards now and hopefully I can be available for the first team.
"I think the manager will probably assess my fitness and we'll go from there. I need to get back in the first team. I want to be out there playing."
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