Since they are playing at Corinthians Stadium, wearing green will be a problem, bitter rivals are Palmeiras, a SP team who wears green. Corinthians has super strict rules about no green around the club. For example, the players can't wear green cleats. There was a polemic a few years back about one of their Nike goalkeeper jerseys having volt green details, and the club covered them up to not display any green.
Their have been numerous fights, stabbings etc in that area for people wearing green, particularly with Torcidas (Ultras which are organized gangs) involved.