Italia 1-2 Udinese (A): Mihai Kratochvil scored a late equaliser for Udinese, after the hosts had been held to a 1-1 draw by the Giallorossi.
Athletic director Marco Bertolini said he felt sorry for the team.
“We had to play a match with an inferior team and that is very difficult to overcome,” he said.
“I had to take into account the possibility that we may lose our place in the competition.”
He added that the players did not feel they were treated “fairly”.
“The fans have a responsibility to ensure the level of the playing is above that of other teams in the league,” he added.
The second leg of the game will be played at 7:00pm (local time) on Saturday.
On Tuesday, the Bianconeri played Udinese 3-0 at the Piazza San Marco, which the hosts won 3-1.
Mihai is expected to be fit to face Udinese on Wednesday.