The three young men, ages 16-, 18-, and 20-year-old, were acquitted on February 27th of their involvement in the killing of Romario.
The popular and promising footballer died from stab wounds suffered following a fight near the E4 motorway in Kista north of Stockholm last October.
The stabbing was the culmination of a feud between two rival groups of young people which began earlier in the day when a fight broke out at a Stockholm-area pub.
The 18-year-old charged in the case suffered an injury to his eye during the bar fight.
To settle the dispute, both groups decided to meet in Husby, the suburban neighbourhood north of Stockholm from which Romario hailed.
Their clash later that evening resulted in a chaotic chain of events and the prosecutor had difficulty proving which of the suspects had done what.
What is known is that the 23-year-old was stabbed to death and two others were badly injured. The injured parties have also appealed the acquittals of the men.