Local police have warned any travelling Chelsea fans to avoid wearing club colours in Warsaw for their Conference League quarter final clash on Thursday.
The Blues travel to the Polish capital on Thursday evening in their bid to secure silverware in Enzo Maresca's first season at the club, in a competition they are heavy favourites to win.
Their quarter-final clash takes them to Poland, where a hostile environment is expected for the club, judging by warnings from both Chelsea and the Warsaw police.
Chelsea have warned fans against sharing the location of the ticket pick-up point in Warsaw with anyone outside of fellow away stand ticket holders.
The police meanwhile have recommended that fans do not wear Chelsea shirts while out and about in the Polish capital.
They also stated that any fans caught in 'cases of lawbreaking' will see police act 'decisively'.
'Both uniformed and plainclothes police officers will be monitoring the areas adjacent to the stadium and will ensure that public order is not disrupted. They will respond decisively to any cases of lawbreaking,' read a statement from the Polish Metropolitan Police Headquarters.
'The huge interest in this match among football fans will mean that there will be more police patrols on the routes to the stadium that day. The capital city police will make sure that every fan arrives safely to the match and returns home safely after the match.
'We appeal to participants and all persons present at the venue of a sports event to inform the police about any threats and disturbing situations they observe.'
Legia Warsaw's ultras, the Teddy Boys '95, carry a fearsome reputation across Europe and are regularly featured in lists of the biggest such groups in the game.
They stole the headlines last season when unfurling an impressive tifo in a Conference League clash in response to having a stand closed for fan trouble in an earlier match.
The ultras section was closed for the knockout round play-off second leg following fan trouble before the tie against AZ Alkmaar, with only U14s allowed in the home end, with a 'this time you won UEFA' banner placed behind rows of empty seats before kick-off.
But it proved to be a false flag as the Ultras had simply moved to another part of the stadium for the game.
And they unfurled a 'Surprise motherf*****s!' banner and let off fireworks as the teams lined-up at the Stadion Wojska Polskiego.
They have also previously held up a banner depicting UEFA officials as pigs with the words '6-1. Because football doesn’t matter, money does!' after being kicked out of the competition following an administrative issue.
The Teddy Boys also however have a reputation for controversial behaviour and hooliganism.
Enzo Maresca has taken the unusual step of arming his Chelsea players with footage of the Legia Warsaw atmosphere ahead of Thursday night’s Conference League quarter-final first leg.
The Blues are set for a challenging away clash in the Polish capital. The Premier League visitors have only been allowed to bring 742 supporters with them due to security concerns, with Legia previously issued a five-game ban away from home and fined £86,000 following trouble in a Europa League clash at Aston Villa in November 2023.
Speaking on Wednesday night in Warsaw, Maresca said: ‘We try to show them some of the environment in this stadium so they can adapt and be ready tomorrow. Fortunately, you know better than me, in England almost everywhere the environment is good, it's nice.
'For sure, tomorrow will be even more, but I always said the same that the players, they are lucky and they have to think that they are lucky to experience that kind of games.’
Asked by Mail Sport if he had sent video clips to his players, Maresca said: ‘Yes, yes. We try always to give them the big picture, not only what they can do on the ball, what they can do off the ball, and sometimes you also need to show them where you go because we have players from different parts of the world, so probably some of them they don't know exactly. We showed them also some of the environment in this stadium.’