The Denmark international has had the initials from Liverpool's famous anthem 'You'll Never Walk Alone' tattooed on the knuckles of his right hand.
"I'd thought about it for a long time," Agger told the club's official website. "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."
Agger, who joined the Premier League outfit in 2006, signed a new contract at Anfield earlier this month.