Rangers say only the "mutual respect of both sets of fans" prevented more severe problems from occurring when the Europa League final was staged in Seville this month.
Eintracht Frankfurt were crowned champions when they beat the Glasgow giants 5-4 on penalties at Estadio Ramon Sanchez-Pizjuan on May 18.
Representatives of Rangers, the Bundesliga club and Football Supporters Europe (FSE) met last Friday to debrief and discuss "several significant organisational issues" during the final.
Rangers on Monday stated that fans were not treated with the respect and dignity that they should have been.
"Supporters Europe (FSE) met to debrief and discuss several significant organisational issues during the recent UEFA Europa League final in Sevilla," a club statement said.
"These issues could easily have led to even more severe problems on the night and it was only thanks to the calmness and mutual respect of both sets of fans towards each other that there were not more severe injuries suffered. All three parties applaud the remarkable calmness of the two fan bases, given the situation they faced.
"Apart from the severe lack of food and – even more critically in the soaring temperatures – of water, there were several organisational problems around policing, body searches and beyond. Both clubs, as well as FSE, received a huge amount of complaints and witness statements from fans present in the stadium.
"All three parties will now work jointly to report back to UEFA and the local public authorities in Spain, and will make recommendations to ensure these problems can never occur again at a European final.
"Fans spend a lot of effort, time and money following their teams all over Europe and expect to be treated with respect and dignity while attending football games. This expectation was not met at all at the Europa League final in Sevilla."
UEFA have come in for criticism following chaotic scenes outside the Stade de France ahead of the Champions League final between Real Madrid and Liverpool on Saturday.