The Reds let the defender go this summer and he admits he misses the club.
The Reds let the centre-back go this summer after he struggled to break back into Brendan Rodgers' starting XI.
Ex-club Brondby was the Dane's chosen destination, while Liverpool had already signed £20 million defender Dejan Lovren.
But Agger admits he misses Liverpool, thanking Reds fans for all their 'positive tweets' since his departure.
Thank you for all your positive tweets the last couple of months.I miss Liverpool too:)hope I will be back to watch a game this year!Y.N.W.A— Daniel Agger (@DanielAgger) November 8, 2014
Although Brendan Rodgers would never seem likely to admit it, hindsight may tell the Liverpool boss he made a mistake by selling the 29-year-old.
The Reds had their problems at the back last season - but they now seem like nothing compared to their current woes.
Another defeat to Chelsea on Saturday, although the Blues are currently the form team in the whole of Europe, further highlighted Liverpool's defensive struggles. Lovren, meanwhile, had another very poor game.
Next up for the Reds in the Premier League is a trip to Crystal Palace after the international break. Last season, Rodgers' men took a 3-0 lead at Selhurst Park but surrendered it, eventually drawing 3-3.