The German referee who was knocked unconscious by Benfica captain Luisao intends to file criminal charges against the player.
Officials were forced to abandon Sunday's (AEST) friendly between the Portuguese club and Bundesliga side Fortuna Dusseldorf after Luisao's body-check on Christian Fischer.
The referee said he briefly lost consciousness before leaving the pitch for treatment after the 40th-minute incident.
Fifteen minutes later he notified Dusseldorf officials he was abandoning the match.
"I am still in a state of shock," he told DPA. "I've never experienced anything like it in my 20 years as a referee."
Fischer was about to show a second yellow card to Benfica's Javi Garcia when he was knocked over by Brazilian defender Luisao. The game was goalless at the time.
Fortuna chairman Peter Frymuth said he would report the incident to European football organising body UEFA.
The referee said he was preparing his own report and sending it to the German Football Association, the DFB.
A DFB spokesman said "the jurisdiction in this case lies with Portuguese sports authorities."
The match was being watched by about 22,000 spectators in the Dusseldorf Arena.
After it was abandoned Fortuna coach Norbert Meier arranged a game between two teams from his squad.
Newly-promoted Dusseldorf has to play the first two home games of the Bundesliga season before a restricted crowd capacity after a pitch invasion by fans during a relegation/promotion playoff match against Hertha Berlin in May.
Fortuna Dusseldorf was relegated from the Bundesliga as Hoffenheim and Augsburg staged final-day escape acts.