Manchester United's Champions League game against Villarreal in Spain has been declared "high risk" by the country's anti-violence commission.
The statement, issued by Spain's Interior Ministry, did not give specific reasons for the declaration.
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"The State Commission against violence, racism, xenophobia and intolerance in sport has declared the Champions League match between Villarreal and Manchester United on Nov. 23 as high risk," the statement issued by Spain's Interior Ministry read.
It means the home club will have to reinforce security measures, including an increase in police officers on duty at La Ceramica stadium, which has a 23,500 capacity.
The game is sold out, with United having been allocated 2,000 tickets for the game.
United lead Group F, while Villarreal are second in the standings and level on seven points after four games.
United won 2-1 against Villarreal on Sept. 29 to avenge their painful penalty shootout defeat to the Spanish outfit in the Europa League final in May.
On Dec. 8, Villarreal, who are 12th in La Liga and coached by former Arsenal manager Unai Emery, travel to Bergamo, Italy, to face Atalanta in their final Group F game, while Ole Gunnar Solskjaer's United host Young Boys.