T-Mobile US (TMUS) is preparing an alternative plan if a deal to sell wireless assets to Dish Network (DISH) falls through, according to Reuters, citing sources familiar with the situation.

Its investment bank, Goldman Sachs, reportedly has told prospective buyers as late as Tuesday it is preparing for an upcoming auction of Boost.

Dish is also speaking with other parties on potential partnerships with Boost, sources told Reuters.

T-Mobile is planning asset sales to secure regulatory approval for its merger with Sprint (S).

Other concessions being discussed include whether T-Mobile and Sprint will divest wireless spectrum, or the airwaves that carry data, and the possibility of giving up more retail customers or retail shops from either T-Mobile or Sprint’s prepaid brands, according to one source familiar with the matter.