How much money will Barça lose by playing against Naples behind closed doors?

The Italian team had planned to displace 5,000 fans for the match at the Camp Nou
The president of Barça, Josep Maria Bartomeu, says that the decision to play the Barcelona-Naples of the Champions League behind closed doors because of the coronavirus will mean the Barca entity "an economic loss of 6 million euros." After the meeting between Barça, the General Secretary of Catalan Sports and the departments of Health and Interior of the Generalitat, the return of the round of 16 of the Champions League will be held on March 18 behind closed doors, and Bartomeu considers it logical that So be it. «We are very sorry that this affects our partners and fans and the world of football in general, but what is important is health. With this virus, we are experiencing an exceptional situation and we must be jointly responsible for solving it, ”he said during his participation in the Barcelona Capital Forum, organized by the Equestrian Circle of Barcelona.
After 1-1 of the first leg, Naples planned to move 5,000 fans to Barcelona who will not be at Camp Nou, and the Government has banned flights between Italy and Spain. In any case, Bartomeu was convinced that the match will not be suspended under any circumstances: «The players of Naples will surely come. There are a few days until next Wednesday, but I am convinced that they will arrive ».