Why American football players and soccer players are not playing together? Because they are playing different rules that make them different games. If a soccer player wants to play soccer, he/she must follow the rules. It's simple like that. If the female player thinks she can bend a rule (rule of not wearing anything, including hijab, on head) because of religious reason, the person is, at the same time, inviting the soccer officials to bend her religious "rule" of wearing hijab. If she thinks she has right to violate others' rule, the others should have the right to change hers as well. If she insists on wearing her hijab, she is playing the game with a different rule. Why would she even bother to play with others who follow all the rules?