Boca Juniors captain Pablo Perez compared incidents before the Copa Libertadores final to "war" after the second leg was postponed.
Boca's bus was showered with projectiles, with some smashing windows of the vehicle, before the clash was eventually pushed back by 24 hours.
Perez, who was reportedly one of three players taken to hospital for assessment, was unhappy with the pre-game incidents.
Boca Junior captain Pablo Perez after shards of glass entered his eye after the Boca team bus was attacked by River Plate fans. Really is shocking. pic.twitter.com/YOATiGEHJs— DaveOCKOP (@DaveOCKOP) November 24, 2018
"I'm feeling hurt," he said. "This was supposed to be a party and it seemed more like a war."
Perez, whose team were held to a 2-2 draw in the first leg at home, confirmed he had suffered an eye injury.
"I've got an irked eye. They told me I have some injured spots in my eye," he said.
"That could be caused by the glass splinters they got out from there."