The reason is protests of the mentor against the decisions of the main referee in the semi -final match against Inter, which took place on May 6 in Milan (3: 4 in extra time).
On Friday, August 8, UEFA decided to remove the Flik and his assistant Marcus Zorg because of “improper” behavior during the duel. They will miss one match and have to pay a fine of 20,000 euros.
In addition, Barcelona players Lamine Yamal and Robert Lewandowski also sentenced them from the organization. The UEFA Committee on Ethics and Discipline fined the football players for five thousand euros-they ignored the requirements of the Doping Office and were late for the planned sampling.
The Catalan Club will pay 5 250 euros for throwing different items from the stadium stands and 2,500 euros for using pyrotechnics.

Source: Sport.ua