Barca still improving: Flick warns rivals after thrashing Dortmund

The Catalans put one foot into the semi-finals with the first leg thrashing of last year's runners-up at the Olympic Stadium. Barca are the competition's top scorers with 36 goals and their dynamic attacking trio of Robert Lewandowski, Raphinha and Lamine Yamal strike fear into the hearts of opponents. "I want to keep improving, today we saw some points we can improve on," Flick told reporters. "We will analyse this game and I will tell the players they did very well, but there are still things to improve.