It does seem likely Vidic will escape with a single game suspension, that would rule him out of the return meeting with Otelul at Old Trafford on November 2.
However, UEFA will have the final say, even if Nani feels German referee Felix Byrch got it wrong.
"In my opinion it was a yellow," Nani said of Vidic's challenge.
"I thought it was a mistake by the referee.
"It is unlucky for Vida but that happens sometimes.
"We forget about that now and look forward to Sunday.
"It will be important to win and everyone is hoping for the chance to contribute."