Anti-racism campaigners believe players are nearing the point when they will walk off the pitch if they continue to be subject to racist abuse, but concede it will be a "massive decision" to take.
England players including Raheem Sterling, Danny Rose and Callum Hudson-Odoi were abused during Monday's 5-1 Euro 2020 qualifying victory in Montenegro.
UEFA has opened disciplinary proceedings against Montenegro, including a charge of racist behaviour which, if proven, "is punished with a minimum of a partial stadium closure", according to the regulations of European football's governing body.
