Walter Smith fears UEFA will ban Rangers from Europe for the crowd trouble in Bucharest, reports the Scottish Sun. European football chiefs have hit Gers with two charges of improper conduct following Wednesday's 1-1 draw with Unirea Urziceni.
The Romanian minnows were yesterday also charged by UEFA over inadequate stadium entry procedures.
But Rangers boss is worried his club's past record could count against them as UEFA's patience finally snaps.
Smith said: "We've received warnings before and it will be hugely disappointing if it impacts on the footballing side of things.
"Whether you are critical of the fans or critical of the policing and the stewards is left to other people.
"But it's a situation Rangers have been in before.
"We can't run away from the fact if the consequences mean we do have to miss European games that would be an enormous blow for the club.
"I haven't really spoken to Martin Bain, so I have no indication as to what UEFA are proposing.
"But the thing Rangers can't run away from is it's not an isolated incident.
"In the current climate it's the last thing the club needs. European football is important."
UEFA also confirmed Unirea are also now in the dock.
A spokesman said: "UEFA has opened disciplinary proceedings against Unirea Urziceni over spectator entry procedures."