The 28-year-old’s current deal does not come to an end until 2016.
Agger says he is happy at Anfield and has no great desire to move on.
"The (Barcelona) move was up to the club," Agger is quoted as saying by Ekstra Bladet.
"The club would not sell me. I do not know [if I will play at another club]. Right now I have two-and-a-half years left on my contract, and I intend to fulfil my contract.
"I'm glad [to be] at Liverpool and playing well. We have a great team, and if I can win something it will be great. Liverpool is a huge club," he added.