Petrovic told chelseafc.com: "A lot has happened already since I came to Chelsea.
"This is my second trip to Wembley. The first one in the final of the Carabao Cup was a big experience for me, now we already know what we can expect from this game.
"Also we play against Manchester City, so it's a big game, a semi-final, and I know that the FA Cup here in England is very important. It is the oldest club tournament in the world. I knew before I came here, because I watched all the English football, the Premier League and the FA Cup games.
"I didn't see the FA Cup from the first round, but I was watching a lot of the later rounds, and definitely the semi-finals, before I signed for Chelsea. So I heard the commentators saying about how old and important a competition it is here, but also you can feel that once you are here.
"The FA Cup is also very important for us because if we win the trophy we will play next year in the Europa League. So it's very important for us, but also every game is important for us in the Premier League.
"Also for us the Carabao Cup was important for the whole team, every game for us is important and every team wants to take home a trophy and play in a final and play at Wembley. So we know what we need to do and the FA Cup is a very important trophy for us players and for the club also."