The Denmark center-back — who last week signed a new long-term deal with the club — returned to Melwood this summer sporting the new ink, much to the delight of fans.
Agger insists the tattoo was something he'd considered for a while, and he was more than happy to go under the needle once again to show his commitment to Liverpool.
"I'd thought about it for a long time," he told Liverpoolfc.com. "As I said, I feel a part of this club — and I feel a part of this city. I have been here so long now, so it was an easy decision.
"I am proud to be here and I think my knuckles show that."
News of Agger's new contract was greeted with joy from fans across the world when it was announced on Liverpoolfc.com last Friday afternoon.
The 27-year-old is relishing life under Brendan Rodgers, particularly the footballing ideologies the boss is instilling within the squad.
"I am enjoying life under the new manager," Agger said. "I really like it and I am happy every day going into training.
"I really feel we have a good team, a good mentality and a style of good football that I want to play. I definitely believe we can get back [to the top].
"I'm not a fan of looking into the future. I take every day as it comes, but I work hard every day and try to achieve the goals I want to. It's important everybody is focused to achieve those goals."
"In terms of points, it hasn't been that good [so far this season] but I think we've played really well," he added.
"We've made a few mistakes, but in general we've played good football and now we just need the results. At the end of the day, that's the most important part."
Photo via LiverpoolFC.com