The Italian media has reported that two Bayern Munich fans were briefly kept in hospital with stab wounds before Tuesday night's Champions League match against Napoli.

The Ansa news agency said two men aged 42 and 47 were admitted to hospital after telling police they were walking in town late on Monday when people aboard two scooters stabbed them in their backs with a knife.

Napoli and Bayern are playing a Group A match at the San Paolo Stadium. It is Bayern's first visit to Napoli since 1989.

The Naples mayor, Luigi de Magistris, condemned the stabbings, saying: "Episodes like this offend the festive spirit and positive expectations around the city."