Multiple teams are preparing to approach the San Francisco 49ers about their interest in trading for holdout guard Alex Boone, according to a league source. Boone has held out since early in the offseason. The two sides are not close to a contract extension and Boone is believed to be prepared to stay away from the team until he gets a new deal. He has two seasons remaining on his contract that will pay him about a total of $4 million. Source: ESPN