Manchester United are helping Manchester City in their preparation for the Champions League trip to Napoli.

The Daily Mail says City officials have taken advice from neighbours United ahead of their potentially volatile trip to Naples in the Champions League.

Roberto Mancini's team face Napoli in what could be a decisive Group A clash in three weeks as the clubs battle for second place behind Bayern Munich.

City have security concerns about the trip after six Bayern supporters were stabbed near the stadium last month and Liverpool fans were attacked before and after a Europa League tie a year ago.