Trossard scored the only goal in a drab 1-0 win over Manchester United at Old Trafford.
Despite United having numerous injuries and fielding a near reserve eleven, Arsenal barely mustered real chances on goal and squeaked through with a win.
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"Maybe it wasn't the prettiest game but credit to the guys, we defended so well. We kept another clean sheet and one goal is enough to win the game," the Belgian forward told BBC Sport.
"We were struggling a little bit so it was so nice to get the win. When you're only 1-0 up it is always a bit tricky.
We were trying to score a second but they are dangerous on the counter attack.
It is a great run for us and now we take it to the final game. You never know what is going to happen."