Rangers have appealed against UEFA's ruling that Thursday's UEFA Cup tie against Anzhi Makhachkala must go ahead in crisis-torn Dagestan.
Chairman David Murray stopped short of his earlier threat to pull the club out of the competition if Rangers were forced to travel there.
But it was clear Murray was unhappy with UEFA's decision this morning to give the green light to the first round, first leg match.
Murray warned UEFA he was prepared take the matter to the Court of Arbitration in Sport, the Swiss-based independent body who settle sporting disputes.
He wants assurances his staff will be 100 per cent safe in Dagestan and is pressing for a compromise and for the match to be switched to another Russian city.
Dick Advocaat's side are due to meet Anzhi Makhachkala in the Dagestani capital, which is close to war-torn Chechnya and has been rocked by car bombs in the past few days.
The British Foreign Office have advised Britons not to go there after Westerners were kidnapped.
Rangers had asked for the game to be moved to another venue, but UEFA today rejected the application.
PA