The defeat they experienced in the match against Milan this week did not suit Inter. They will face a stronger team than Milan in the champions league. They need more than just the game they played in Milan to beat Liverpool. With this defeat, he lost an important 3 points in the league. If he wins in Napoli today, we can say that Inter will close the week with a loss of 9 points.
I would guess that it would actually help them? Like in a "we have to win this because we lost to Milan, two back to back bad wins would hurt us and fans will be mad" type of situation? Obviously you could try to play as well as you hope and could end up losing as well. I am not saying that they could end up losing or winning or anything here, the result is still unknown and we have no idea.
However, at the very least we know that they will do their best. They could be great, they could be horrible but we all know that they will go out there and play with 100% in order to win. If Liverpool ends up not caring enough or thinking Inter can't win or something like that, then Inter actually has a good chance.