The club's head of safety and security, Laurence Macintyre, revealed that fans who were banned from Ibrox were present in Pamplona as Rangers bowed out of Europe after a 1-0 defeat.

Rangers blocked such supporters from obtaining tickets through official channels, but Macintyre claims they had made the trip anyway and gained entry to the stadium.

Many supporters accessed Osasuna's El Sadar stadium with tickets for home sections, and ugly scenes erupted in the second half when police wielding batons were seen to be striking Rangers supporters.

Supporters claimed riot officers charged in for no reason and claim police lashed out with sticks, fists and kicks before, during and after the match at Osasuna's El Sadar stadium.

The Glasgow club have since officially complained to UEFA about the lack of segregation and heavy-handed policing at the match.

Macintyre was concerned to see some unwelcome faces in the crowd and said: "There are people in that crowd who should not have been there, and they should not have been because I know that I've banned them either indefinitely or I've banned them for life from attending Rangers games.

"One individual that I met only last week - and blocked him getting a ticket for that game last night and told him under no circumstances did I expect him to be there - he's in that picture as well."

Rangers admit more away fans than were allocated seats for the away section gained entry to the 20,000-capacity stadium. Flags bearing the name of hooligan group Inter City Firm were seen in the ground.

However chief executive Martin Bain insisted Osasuna should have been prepared for the size and type of the club's travelling support as he urged UEFA to launch a full investigation.

Bain told Sky Sports News: "I think Osasuna showed last night that they were greatly inexperienced in handling a crowd of the magnitude that came.

"Yes we only had 1,400 tickets, but we did make the authorities aware that when a club of this stature travels it does bring fans in numbers.

"And despite the process of this club - please don't travel if you don't have a ticket - it happens and therefore we expect the authorities to be able to cope with it."

UEFA stressed they would need to hear from Rangers and from officials at the match before deciding whether any action was necessary, and that documentation was reaching Nyon this evening.

A decision on whether to take action is expected tomorrow.

If UEFA find that Rangers supporters were responsible for the trouble, the club could face punishment.

However Rangers believe UEFA will find that excessive force was used against fans by police, causing the chaotic scenes.

The Rangers Supporters Trust have asked fans to provide accounts of events.

The club also plan to set up a special meeting where fans can reveal personal experiences from the trip.

A spokesman said: "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 and we anticipate UEFA will launch a full investigation.

"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."

Spanish police were also accused of heavy-handed tactics during last season's Champions League clash between Villarreal and Rangers in Spain.

And in December 2002, Celtic supporters said they were the victims of police violence during an incident at Vigo airport in Spain as they returned from a UEFA Cup game.

It also follows similar claims of police over-reaction at the Lille v Manchester United Champions League tie match in Lens, France last month.

Several English fans were injured as they tried to escape overcrowded sections of the ground, and United made an official complaint to UEFA following the incident.