Barcelona fans are turning up the heat ahead of their Champions League showdown at Camp Nou, while Inter supporters have been ordered not to wear club colours.
It kicks off at 20.00 UK time (19.00 GMT).
You can follow all the build-up and action as it happens from this game and Napoli-Ajax on the LIVEBLOG.
The Blaugrana know this is a must-win game to keep their Champions League hopes alive, as they lost 1-0 at San Siro.
Their supporters are putting on a remarkable atmosphere outside the stadium, first a large contingent marching towards the arena throughout the evening, then welcoming the team bus with fireworks and flares.
Meanwhile, Inter fans have been advised not to wear their club colours inside the arena or even around the city, for fear of reprisals, but also to keep the Camp Nou stands in blanket red and blue shades.
An Inter fan who spoke to Sky Sport Italia said he’d been given the ticket by a friend who is a Barcelona supporter and the news of the colour ban was only announced last night, so he was wearing a zip-up top over his Inter shirt.
Barcelona was lucky to get the point…