Rome's ability to host this season's Champions League final will be questioned once more after an Arsenal fan was apparently stabbed in the leg outside the Stadio Olimpico last night.

Arsenal have warned supporters attending tomorrow night’s Champions League clash with Roma that they are “at risk” if they travel alone to the Stadio Olimpico.

Manchester United fans have been warned they will be kept behind in the Olympic Stadium for 90 minutes after the end of Wednesday’s Champions League quarter-final with Roma.