BANGKOK — The global sports market is worth hundreds of billions of dollars a year. Now, this powerful industry is coming together to promote an unlikely cause: human rights.

Since late November, a Bahrain-born soccer player for a minor team in Australia has been held in detention in Thailand. The player, Hakeem al-Araibi, 24, is not a famous athlete. He has no lucrative sponsors.

But he has spoken out against one of the most powerful men in international soccer, who is also a member of the ruling family of Bahrain. His testimony of torture at the hands of Bahrain’s repressive government earned him refugee status in Australia, which determined that he faced credible threats of persecution should he return to the Gulf state.

Still, over the past week, Mr. Araibi has collected an impressive list of supporters in the world of international sports.