Aleksandr Ryazantsev and Karadeniz Gokdeniz struck for Rubin as they defeated Barca 2-1 on the night, with Zlatan Irbahimovic netting for the hosts.
"It was just a slip. We must accept the defeat and look ahead. We have not had a good result, but we're even in the group and this can be sorted. I'm sure we'll get through," Laporta told Sport.
The president went on to say that Barca cannot always win, and suggested that the performance of the team was worthy of praise.
He added, "We cannot win forever, but I must congratulate the players for their efforts."