The match apparently passed without any real trouble and there were no arrests but an article in the Spanish newspaper, El Mundo Deportivo, headlined 'Don't Ever Come Back', reportedly accused drunken fans of vomiting and urinating in the streets and of provoking trouble.
It also reportedly claimed that the club should not be in the competition because their players are "dirty butchers who can only defend".
But Rangers' security and operations manager Kenny Scott branded the allegations "ridiculous".
"The report is a completely over-the-top attack on the Rangers players, the club and its supporters," he told the Scottish Sun. "It is so far wide of the mark it is ridiculous.
"There were no arrests and no disorder that caused the authorities any real concern.
"It is staggering that a so-called sports paper can insult a team lying second top of their Champions League section and claim it should not be in the competition.
"We had very good relations with Barcelona and the police and the authorities over the two games.
"Something like 25,000 went abroad without any great problems.
"To insult players in such a sensationalist fashion is really disappointing, since there were great relations between the two clubs over the two games.
"What has been reported does not represent the feedback we have received from UEFA, the Scottish and Spanish police and Barcelona."
Rangers fans chief Jim Templeton also slammed the reports.
Templeton, president of the Rangers Supporters Assembly , claimed to be shocked by allegations of misbehaviour among some of the Light Blues supporters who journeyed to Catalonia.
Templeton said: "I refute all these allegations absolutely. They are shocking.
"There were around 25,000 fans in Barcelona and there were no arrests so I don't know why they are doing this.
"Their equivalent of our chief of police stated that he had had no problems with the Rangers fans and they would be welcome back any time.
"Before the game they were trying to stir things up and kept referring back to the trouble when Rangers were over there for the 1972 Cup-Winners' Cup final and trying to make us out to be hooligans.
"And I know there were some things said in the Spanish newspapers after the game about the litter that was dropped but, as it was translated to me, they were making something of a joke about it.
"There were 25,000 fans there and no arrests - that says it all."