An unnamed source told ESPN the Magazine's Buster Olney that Bell will become a member of the Giants' bullpen if San Francisco and San Diego can agree to terms on a trade.
The Giants have two days to complete a deal. If the teams can't agree to a deal then the Padres likely will pull Bell off waivers, and he would stay in San Diego at least through the end of the current season.
Bell has 35 saves and a 2.55 era in 53 innings this year for the Padres. He came into the 2011 season off two consecutive 40-save seasons, including a career-best of 47 saves in 2010.