The phrase "potential challengers" refers to people or things that could possibly compete or oppose each other or a specific situation in the future. Full definition
Without a go / no - go decision from incumbents and an unclear field of potential challengers, it's too early to decide who is the most endangered. (voices.washingtonpost.com)
It led to the rules on challenges being amended in 2010 from «nominations shall be sought each year» to «nominations may be sought by potential challengers each year». (theconversation.com)
While he didn't disclose the names of the other potential challengers, he said the party will have a strong candidate in 2016. (auburnpub.com)