The Brazilian team took the lead shortly after half-time, but they failed to hang on as Lanus battled back to take a 3-1 win after going behind
There may not have been a fairytale finish to Chapecoense's first-ever Copa Libertadores game in front of their own fans, but Rossi at least gave them something to smile about with a fine goal.
The former Goias striker, who moved to the club in December following the heart-breaking plane crash that claimed the lives of most of the first-team squad, picked up the ball in the area following a scuffed shot.