News that a French national had been arrested in connection with a possible attack on the tournament raised fears, but local authorities plan a large operation to ensure safety
Paris police prefect Michel Cadot insists his forces are well prepared to deal with any security concerns during Euro 2016.
The terror attacks carried out on Paris in November, killing 130 people, raised fears over the potential for repeat incidents at the European Championship, which gets under way in the capital on Friday.
Earlier on Monday, Ukrainian security agency SBU announced it detained a Frenchman last month who had amassed a cache of guns detonators and large quantities of TNT, with the intention of carrying out mass attacks at the tournament.