Chargers wide receiver Vincent Jackson could miss as few as three weeks or as many as six, depending on whether or not he gets traded. Jackson was placed on the roster-exempt list by San Diego, a designation that carries a three-game suspension with it. He also has a league mandated three-game suspension for violating the substance abuse policy, which will be served beginning Week 1. According to an NFL spokesperson, if Jackson was traded and reported to his new club before the Sept. 4 deadline for final roster reduction, then his roster-exempt suspension would be served concurrently with the league-mandated suspension. He would then he eligible to play in Week 4.