White Sox catcher Tyler Flowers.

GLENDALE, Ariz. -- White Sox catcher Tyler Flowers is out of the lineup for a second consecutive day because of lower back stiffness. Flowers said his back tightened up on him Friday morning.

"I think it might be sleeping funny or something, maybe a little dehydrated from that 107 in Tempe (on Thursday when temperatures climbed into the mid 90s in the Sox game against the Angels). But [trainer] Herm [Schneider] is kicking my butt in there so we should be back shortly.''

While Flowers' tone was optimistic, there is always cause for concern with back issues, especially for a catcher. The Sox open the season in 16 days.

Flowers was maintaining a sense of humor when asked how it affected his range of motion.

"I've never had much," the 6-4, 245-pounder said.

Hector Gimenez will catch Chris Sale when the Sox play the A's at 3:05 p.m. (CST).