The Centre may allow foreign firms to bid for spectrum and form their Indian ventures later, as against the present rule that they set up joint ventures before entering auction. “Some people have asked that foreign companies be allowed to participate and form their Indian venture later. At the time of the 3G auction, this was allowed. We are trying, based on the demand, and if required we may do it,” Sadhna Dikshit, Member (Finance), Department of Telecom, said on Thursday.