UEFA is monitoring the situation in Ukraine ahead of Thursday's Europa League tie between Dynamo Kiev and Valencia.
There have been nearly three months of anti-government protests that have paralysed parts of the country's capital in a struggle over the identity of a nation divided in loyalties between Russia and the West.
The violence has recently escalated, with Ukrainian authorities saying 25 people have died and more than 240 have been injured during clashes between police and anti-government protesters since Tuesday.
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Such troubles have put the Europa League last-32 first-leg fixture between Dynamo Kiev and Valencia in doubt.
Dynamo Kiev president Igor Surkis has attempted to allay fears for those travelling with the Spanish club and offered an assurance that the Olimpiyskiy stadium is ready to host Thursday's match.
However, a UEFA spokesman said: "We are monitoring the situation and a further update is expected today."