Police in Warsaw were preparing for trouble as Russian fans flooded into the capital for a key Euro 2012 match with Greece after the worst violence of the championships erupted in the city Tuesday.

Russia’s high-voltage 1-1 draw with Poland saw police detain 184 hooligans - 157 of them Poles - as fans clashed with riot police and each other, and fears were running high the violence could be repeated on Saturday.

Russian fans have some 20,000 tickets for the game, compared to 4,000 for the Greeks, Marcin Herra, Poland’s Euro 2012 chief, said Friday.

“No significant changes have been made compared with the police units deployed before the previous game,” Herra added.

On Tuesday, authorities put more than 6,000 officers, including riot squads armed with water cannon, tear gas, rubber bullets, dogs and pepper spray on the streets in Warsaw.

The Russia-Greece face off begins at 8:45 pm, at the same time as Poland’s crucial encounter with the Czech Republic in the southwestern city of Wroclaw.

Herra said the organisers would only broadcast the Poland-Czech match live in the “fanzones,” areas reserved for supporters in several Polish cities.

“Russian and Polish fans met (Thursday) in Warsaw and the atmosphere was very friendly, that’s a good omen,” Herra said Friday.