Craig Gentry will be sidelined for a few days after an MRI revealed a lower back strain. The A's are going to be extra cautious with their new outfielder, with manager Bob Melvin saying he didn't have a timetable besides "into next week some." Gentry's drive from Texas to Arizona is believed to be at the root of the problem, which he aggravated during batting practice. The injury shouldn't have an impact on his readiness for spring games.