Genoa boss Cesare Prandelli admits he's disappointed to be losing Krzysztof Piatek.
The striker will join AC Milan after Monday's defeat.
"No fans? We must try to get back all our strength," Prandelli said after the game.
“If we all stick together, we can do well in the second round of the season. I'm convinced of it.
“It's perhaps the first time that I've been involved in a game on a Monday afternoon: there was a peculiar atmosphere and it certainly affected us.
“Piatek? When I arrived there were no plans to sell him, but then the club weighed things up.
“He was at the stadium today, but I have to think about training the lads I have available, trying to convey to them the right mentality for this club.
“We've created a lot but nothing materialised. We were very compact, but in the second half, after we conceded an avoidable goal, we had to come out and conceded our second goal on the counterattack.
“However, it remains a good performance. We just have to take away all the negativity."