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Napoli's home fixtures are some of the most highly policed in Europe Chelsea have urged fans travelling to Naples for Wednesday's Champions League game to "exercise extreme caution" after two supporters needed hospital treatment. The Italian city has a long history of cases of away supporters being targeted by Napoli ultras. "The club is aware of an incident that took place on Tuesday evening in Naples, " a Chelsea statement said. "Two fans are being treated in hospital, having sustained non-life-threatening injuries. The club would like to remind all supporters to exercise extreme caution whilst in the city and take note of the advice shared ahead of this fixture. " Fans on social media claimed Chelsea supporters had been stabbed, but there has been no official confirmation of how the injuries were caused. Around 2, 500 Chelsea supporters have tickets for the game, with fans urged to meet at designated areas so they can travel to the ground by shuttle bus under police escort. In travel advice that was issued to fans earlier this month, Chelsea said: "During Uefa competition matches, attacks on away fans have sometimes occurred in Naples. " Supporters have been urged not to walk around the city and to avoid wearing club colours or emblems that identify them as Chelsea fans. Liam Rosenior's side need a win against Napoli at the Stadio Diego Armando Maradona to go directly into the last-16 stage of the Champions League. Their hosts - Serie A champions last season - are seeking a win to stay in the competition. Latest Chelsea news, analysis and fan views Ask about Chelsea - what do you want to know? Don't take Brook's WWE beer celebration wrong way - Root Bayern legend? How Kane is viewed in Germany as contract talks begin Conte reunion a sharp reminder of Chelsea's fall Comedy thriller starring James Corden and Mathew Baynton A faceless hacker threatens to expose Finland's deepest secrets Chi is once again forced to contend with life and death Greg Foot investigates testosterone replacement therapy Bayern legend? How Kane is viewed in Germany as contract talks begin Why England legend Root is so effective in Asia Global brand in an EFL world - Wrexham finances explained What happens next after latest link between heading and brain disease? Who has made Troy's Premier League team of the week? Why did Alcaraz, Sinner & Sabalenka have to remove fitness trackers? Six English clubs and old foes - all to play for on Champions League final day Can unfancied Scots be Six Nations contenders? F1 testing begins - but why all the secrecy? Cal-fouri, a lesser-spotted law & Russell v the Shed - Prem talking points 'Another unbelievable result' - but what's different about Man Utd now? 'Intoxicating title fight impossible to call as Hearts refuse to buckle' Grudge match or homecoming - what next for Pimblett? Is Sinner-Alcaraz in danger of making majors boring? Copyright © 2026 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.