A significant security measure goes into effect as 5,000 traveling supporters get ready to converge on the Basque city. Quarter-final tie is delicately poised after Barry Ferguson's 10-man team held Athletic Bilbao to a 0-0 draw in first leg at Ibrox According to Spanish media reports, the whole city police force is working their shifts, and they used matches as a dress rehearsal for next month when the San Mames Stadium will host the finale. The police in Bilbao have revoked all vacation time and leaves of absence for officers as they gear up for a significant security operation ahead of Thursday's event. Europa League visit of Rangers . Over 5,000 Rangers fans are anticipated to make their way to the Basque city for the quarter-final clash against favorites Athletic Bilbao. That is despite the fact that Rangers have only been given an official allocation of around 2,600, with fears that some travelling fans may look to infi...