Security for Tuesday's Champions League Group game between Real Madrid and Legia Warsaw at the Bernabeu is being heightened amid concerns over potential trouble involving visiting ultras.
The Group F match has been deemed "high risk" by authorities in Madrid after previous serious problems involving some of Legia's supporters.
Marca reported that Polish police are in Madrid to help with preparations, and that the total number of security personnel will be increased to around 2,200 police officers and security guards.
A heavy police presence is planned for city centre locations such as Plaza Mayor and Puerta del Sol, where visiting supporters often gather.
A security source told ABC special precautions were being taken and said: "There is a lot of concern about this case.
"Normally, the decision on a high risk game is taken four or five days before the game. In this case, Real Madrid and the government have been speaking for more than two weeks ahead of the game against Legia."
Following racist behaviour and crowd disturbances during Legia's home defeat to Borussia Dortmund in September, UEFA ordered a full stadium closure for their next home game, against Madrid on Nov. 2.
Legia's 4,000-ticket allocation for this week's game at the Bernabeu is sold out, with Spanish media reports saying around 300 suspected ultras may have official tickets.
Extra searches are being planned to stop fans bringing flares or fireworks into the ground. Madrid have also attempted to stop any Legia fans sitting elsewhere in the stadium by making impossible to purchase match tickets online using a Polish bank card.
But Katarzyna Cenian, the vice-president of a Polish Madrid fans group called White Eagles, told AS she was aware of people who had been able to find ways around the restrictions.
"We know that people have bought tickets through family members from other countries, using non-Polish bank cards," Cenian said.
"A kid was at the ticket office the other day and bought six, even though he said he was Polish, as he wanted to make sure he had no trouble getting in."