Hansi Flick says his Barcelona team must play with “greater aggression” now that it finds itself in a Champions League mini-slump. Barcelona's 3-0 loss to Chelsea on Tuesday left the team in 15th place ahead of Wednesday’s games, and it followed a 3-3 draw at Club Brugge. At Stamford Bridge, Barcelona was outplayed and its attack failed to score for the first time in 53 games.