Doku scored as City defeated Southampton 2-1 at Wembley on Saturday.
After defeats in their last two FA Cup finals, Doku is desperate to lift the trophy. City will meet the winner from today's semifinal between Chelsea or Leeds United.
“We’re going to watch that game to see who we are playing against,” said Doku in his interview with City Studios.
“Either way we have one objective and that is to win the trophy. That’s what we’re going for.
“A very difficult game, a very compact team, a good team, who play football from the back. We knew it was going to be difficult.
“In the second half we pushed and pushed and then they scored the goal. We knew we had to score within the next 10 or 15 minutes.
“We managed to continue what we were doing, pushing forward, and then we scored two nice goals.”