Bain: Fans' behaviour was unacceptable

However, Bain was also critical of the Romanian police tactics and poor organisation at the Steaua Stadium.

"Obviously the behaviour of some of the fans inside the stadium was unacceptable and no-one likes to see that," Bain said on Rangers' official website.

"However, what was equally unacceptable was the fact that Rangers came to this stadium with representatives from UEFA and Unirea a number of weeks ago and arranged for the four turnstiles to be open to give access to our supporters.

"When they arrived this evening there were only two turnstiles open which caused difficulty gaining access and fans then to be sprayed with CS gas is totally unacceptable.

"I will now make representation to UEFA in their behalf."

There was unrest as Rangers fans attempted to enter the stadium before kick-off, while reports suggested some away supporters ripped up seats during the match.

Trouble at the match was described as a "minor incident" by Andy Kerr, president of the Rangers Supporters Assembly.

Kerr told Sky Sports News: "There was a bit of pressure at the front. Spray was used, which was used before the start of the match, and I think people reacted to that.

"I wouldn't say the Rangers fans did anything wrong. The organisation was very poor."