Koeman later said: "An important victory. I'm happy with our fans, there were so many and they were phenomenal.
"The goal conceded? There are goals you can't do anything about. Gaya did it. A great play.
"Aguero? He's an important player. He'll be better with the passing of time. It's not a question of quality, it's just a condition problem.
"Now we head to the Champions League, we want to move forward."