The capital side saw their Serie A fixture with Parma abandoned due to adverse weather conditions after eight minutes on Sunday, while Napoli suffered a potentially-damaging 3-0 defeat.
Garcia does not believe his team's extra rest will help them in their semi-final first leg, but hinted that Rafa Benitez's side could be affected following their weekend disappointment.
"A rest could benefit us and it could not," he old reporters. "Napoli played and lost though, and I think that'll have an effect.
"From a physical point of view we'll be fine, but we won't be in the rhythm that you have when you play - we haven't taken to the field for 10 days now.
"We don't fear Napoli, we just respect them because they have a great side.
"It's a semi-final, played over two legs. It's a match that's 180 minutes long, maybe more. So tomorrow we just want to get closer to the final.
"This match is the most important simply because it is the next one we're playing. On Thursday though, we’ll focus again on the league.
"I'm sure Napoli are going to be at their best, because, like us, they want to make the final."