 Riot police confronted Rangers fans in Pamplona |
Rangers will submit a complaint to Uefa after segregation problems during their Uefa Cup tie with Osasuna. The Ibrox club will also condemn the police tactics at the Reyno de Navarra Stadium in Pamplona after riot police clashed with visiting supporters.
Rangers will consult with fans who travelled to Spain and compile a list of grievances and eye-witness accounts.
"We anticipate Uefa will launch a full investigation," read a statement from the Glasgow side.
The statement said: "Club officials discussed the matter this morning and will make written representation to Uefa on behalf of fans later today.
"We have also arranged a special meeting with the Rangers Supporters' Assembly to share the different experiences of fans that have already and will continue to come to our attention over the next few days.
 |  I feel so sorry for our fans that they have been involved in something like this |
"It is important the fans' representatives see documentary proof of the strenuous efforts the club made to ensure that everyone could safely attend this match.
"In the meantime everyone associated with Rangers Football Club and with its interests at heart are bitterly disappointed with events in Spain.
"There were clearly people in the relevant section of the ground too that the club would not have expected to have been there and we will follow this through."
Riot police moved into the stands to separate rival fans as Rangers crashed out of the competition.
The police had stood in a line in front of the visiting fans for around 10 minutes before an incident then saw them wade in among the Rangers support, scattering the fans.
The Ibrox club's chief of security Laurence MacIntyre told BBC Scotland he was unhappy with how police reacted.
Macintyre said: "I never saw anything, with an experienced eye, that merited the very severe treatment and indiscrinminate batoning of fans.
"It was completely out of order, in my opinion."
And Rangers chief executive Martin Bain told his club website that, despite repeated requests from Uefa, Rangers and the British ambassador to Spain, arrangements in stadium were not right.
"We are really disappointed that, despite all the preparatory work that was done by ourselves and the British ambassador, and the fact that there was a special security delegate appointed to this game, there was still a lack of segregation in this ground," he said.
"We witnessed a letter from Uefa to Osasuna demanding that they put segregation in the ground.
My Sport: What is your view on the events in Spain?
"There is no doubt about it that there is a small element that attached itself to our support tonight, but the vast majority of Rangers fans were intimidated by heavy-handed police."
Bain also said that the British ambassador would make representations to Uefa as well.
Rangers' Spanish striker Nacho Novo added: "The police in Spain do have a reputation for being too aggressive with foreign supporters and that seems to have happened again.
"I feel so sorry for our fans that they have been involved in something like this."
The Spanish authorities reported three arrests after street disorders, while two fans spent the night in hospital.
Those detained were later released.
One of those taken to hospital had drunk himself into a coma and was treated for alcohol poisoning, said police. The other fan was treated for a cut mouth.
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