You can show your colours when you're in the stadium, just don't show them in a bar, it'll be fine.
Even I that I'm local can pass as tourist if I'd like to, many people thought I was Brazilian, Arab, American, English, seriously not that hard to do, there are just tourists in the centre.
Anyway there will be a security cordon to enter the stadium, thousands of police offers and probably City will arrange some coaches too, just to be sure everyone is safe.
Enjoy your trip, the city is wonderful and I'm not biased even though I've been living here my whole life. Once you go to Rome, every city will be delusional, guaranteed it'll be in your top 3 forever.
Even I that I'm local can pass as tourist if I'd like to, many people thought I was Brazilian, Arab, American, English, seriously not that hard to do, there are just tourists in the centre.
Anyway there will be a security cordon to enter the stadium, thousands of police offers and probably City will arrange some coaches too, just to be sure everyone is safe.
Enjoy your trip, the city is wonderful and I'm not biased even though I've been living here my whole life. Once you go to Rome, every city will be delusional, guaranteed it'll be in your top 3 forever.