Sparta Prague officials have revealed they have put Czech diplomats in the UK on high alert for their powderkeg match against Rangers.
Club chiefs claim they were bombarded with "disgusting threats" following their controversial first meeting in September.
Rangers will introduce new manager Giovanni van Bronckhorst for his first game in charge in the penultimate match in the Europa League group stage, with the sides both on four points.
But there is lingering bad blood between the clubs and UEFA will take the unusual precaution of assigning their own special Security Officer to the match and Sparta have urged their fans to keep a low profile in Glasgow.
UEFA investigated the game in Prague in which Glen Kamara was booed in front of 10,000 schoolchildren who were allowed access to the game despite a Sparta stadium ban for racist fan behaviour in a previous game. That came after Kamara was racially abused by Slavia defender Ondrej Kudela last season.
But European football's governing body took no action, despite the row escalating to diplomatic avenues with the UK ambassador in the Czech Republic being summoned for talks.
And now Sparta, who are also taking their own security staff to the trip, have revealed they have put Czech diplomats in the UK on alert for the tie.
Sparta communications director Ondrej Kasik said: "It has to be said, we are approaching this match in a much different way to our normal European away matches.
"That was made clear to us just a few hours after the first game when our club's email and social media networks were flooded with threats and disgusting content.
"So we are in constant contact with Czech diplomatic representatives in Great Britain and they will help us with everything we need.
"Although the processes and communications that take place are standard. The Czech police are in contact with their Scottish counterparts and we are talking directly to Rangers, it's all much more extensive, more intense and more detailed than usual.
"Our job is to try to ensure the players and the management team concentrate only on the football."
