Manchester United supporters have been advised not to wear club colours in the Russian city of Rostov for their own safety.
Jose Mourinho's side will be there for a Europa League last-16 tie on Thursday to face home side FC Rostov.
Spectators have been warned after violent clashes between English and Russian fans at Euro 2016.
Those travelling to watch United have been told to stay in groups and not attract attention to themselves.
According to The Telegraph, the advice was printed in a letter by Sam Kelleher, United’s Head of Ticketing and Membership.
"For you safety and security you are advised not to wear Manchester United colours when in Rostov, or attract attention to you presence in the city," he wrote.
"It is also advised you stay in groups where possible, and do not walk around the city alone.
"It is not just opposition football fans who may potentially pose a risk to your safety, and incidents of serious disorder during the European Championships in France last summer, involving violent individuals and groups emanating from Eastern Europe, should be remembered when considering your movements and actions, and any potential risk."
The second leg will take place at Old Trafford on Thursday, March 16th.
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