In that game, United were a constant threat, particularly on the counter-attack, and went on to win 2-1 at the Etihad.
But at Old Trafford, the Spaniard thinks the onus will be more on Ole Gunnar Solskjaer’s men to come at City.
"They play the first game at home they may want to try to show initiative, squeeze us a little more, be a little more the protagonists, and if they have fresh players who have rested this weekend, put a lot of intensity to the game.
“They feel comfortable awaiting for the opponent to lose the ball and break into with counterattacks.
“We need to be aware of that, try to not make mistakes in dangerous areas and not to lose balls that can help them to play how they want.
“We know they are a team that feel comfortable playing with fast transitions.
“Maybe they want to prioritise this competition a bit, but we want to retain this trophy.
“This is a semi-final; we are just two games away to fight for a trophy. I think it will be a very complicated tie. It's a derby and this always adds some extra tension, so we’ll see.
“If I have the chance to play at Old Trafford it would be very special because is one of the most iconic stadiums in football.
"The truth is that the last week and a half has been something crazy because I had the opportunity to play both Premier League games, so I'm very happy.”
Pep Guardiola recently praised the 18-year-old, commenting that he believes he may possess some of the qualities of Barcelona star Sergio Busquets.
Garcia, tempering the comparison, responded: “Knowing that Pep is happy with how I work and what I do when I have a chance is very important to me and pushing on to continue working even harder.”