Barca fought back to win 5-3 in extra-time of this week's quarterfinal.
Soldado, who had scored for Granada in normal time, was left raging at Barcelona coach Koeman for the way he celebrated his side's two goals in extra time.
"He's a moron, he's a moron," Soldado fumed after seeing Koeman celebrating.
"You are a clown, you lack humility," he added.
Both benches were at each other all night, and each side had a member of their coaching staff sent off