Barcelona coach Hansi Flick has issued a warning to his team to cut down on mistakes as they face off against French side Brest in the upcoming Champions League match. The Spanish league leaders have stumbled in recent outings and are eager to redeem themselves. After defeats against Real Sociedad and a draw against Celta Vigo, Flick underlined the importance of his young team taking a step forward to avoid errors and continue their winning streak against strong rivals.