Jakarta - Barcelona coach Hansi Flick has asked his players not to be complacent ahead of the first leg of the 2024/25 Champions League quarter-finals against Borussia Dortmund.Barcelona are unbeaten in 2025 and still have a chance to win a treble this season. They are at the top of the Spanish League standings and face Real Madrid in the King's Cup final."We can dream (of winning a treble), but the players and the coaches must not be complacent," Flick said on Barcelona's official website on Tuesday.Flick emphasized that his team can achieve success by continuing to work hard and giving their all on the field."We want to continue our unbeaten record this year, but to do that we have to give our best performance against a very strong team," explained the German coach.Unlike Barcelona, Dortmund are in an unstable condition under coach Niko Kovac. However, Dortmund's performance graph has started to improve.Dortmund lost to Augsburg and RB Leipzig in the Bundesliga, before winning against Mainz and Freiburg in the last match.