Barca won 5-2 in Belgrade on Wednesday night, with Flick happy with his young team's continued progress.
Performance:
"They are three important points. It is not easy to win away from home in this competition. I'm very happy. I appreciate what we do. We have played well with the ball and we have defended and pressed.
"The Red Star has played very well, it is difficult to defend against them because they know how to play with the ball. My team has been focused.
"The team is very good. We have good performance. We want to win. They are playing very well, I am enjoying with the team. There are results. We have been focused. "
Pau Cubarsí:
"Pau Cubarsí is fine. Okay, they've given him a few stitches. But he is young. It's okay. He's smiling."
Robert Lewandowski:
"On 99 goals? I didn't know, if I had known ... It's my fault. Today was very good, but we must think of other games. He has been important to us. I am very happy. But I don't look at these things, I think about the next meeting and that's why I changed him."
Jules Koundé:
"He is a good example for other players. He has improved his performances. He is a great professional. It is very focused. I appreciate what you have done. It is very good to see the assistance you have given today."