Brendan Rodgers added to his squad on transfer deadline day by bringing in Mamadou Sakho, Tiago Ilori and Victor Moses from Chelsea to complement the earlier arrivals of Kolo Toure, Simon Mignolet, Iago Aspas, Luis Alberto and Aly Cissokho.
Agger, who was named as the club's new vice-captain, believes they have added quality to their squad with the new signings and hailed the importance of keeping Suarez despite interest from Arsenal.
"It has been a positive transfer window for us." Agger told Danish daily BT.
"We have brought in players with quality and that is what you want. I have not seen all in action yet, but what I have seen thus far is good.
"Of course, it was good that we could keep Suarez. Everyone who knows his qualities on the pitch, knows that he is a player we need."
Agger is also delighted with the side's start to the new season after winning all three of their Premier League games to sit at the top of the table, but the Dane is refusing to get carried away.
"Some more matches need to be played before you can tell whether we can stay at the top and fight for the trophies." added Agger.
"We have got things in order. We haven't conceded goals and that is always a help, because then you don't need to score many goals yourself.
"The city is always positive and that is what has impressed me the most in Liverpool."