Internazionale coach Roberto Mancini says his side can recover the 3-1 deficit against Wolfsburg on Thursday night.
The Nerazzurri will have to produce one of their best performances of the season if they are to stand a chance of making it through to the next stage of the Europa League.
And the Italian is optimistic his side can score two goals without conceding any against Dieter Hecking's men.
"I am always optimistic, sometimes more than I should but as long as there is a chance, we have to believe," Mancini said.
"The players are eager to perform, they want to give a beautiful evening to the fans.
"We have to win 2-0, it's possible, it's not that we're talking about scoring four without a reply. We have to perform, a win would be a boost for the championship as well.
"Every competition Internazionale won included comebacks, some of them were incredible. Also I believe that sooner or later we will enjoy a night without mistakes.
"They [Wolfsburg] are a very good team but anything can happen in one match. They will wait to catch us on the counter but if we take an early lead we would be in a position to control the game.
"I spoke with [doctor Piero] Volpi and we will not take any unnecessary risks [with Xherdan Shaqiri].
"But we have 24 hours, he is feeling well but we will assess him after today's training session."
