City won the semi-final 9-0 on aggregate after the second-leg success at Upton Park on Tuesday night, and the 18-year-old Lopes is hoping his two assists for Alvaro Negredo will provide him with more game time.
The Portugese midfielder's dream is to play at Wembley which may just come true in the final on March 2 as Samir Nasri remains sidelined with a knee injury.
"It was a great night for me and for all the team," said Lopes, who scored on his City debut in the FA Cup third-round win over Watford last season.
"It's a different level, high-intensity 90 minutes, but it's good for me to learn with these players and play these games.
"I have to do my work and my job and hopefully I'll get more chances.
"It's a dream to be in Wembley. I'll keep working for that and I hope I can be there."
And it wasn't just Lopes who was thrilled with his own performance, as coach Manuel Pellegrini was effusive in his praise of the teenager.
"Marcos is a young player with a great future," said Pellegrini.
"He is just 18 years old and played with the personality he needs to play in our team.
"I see him work every day of the week, so I was sure he would realise the kind of performance he put on.
"I'm very happy for him because he deserves to do it - and he is a very important player for the future of the club."