Martinez had X-rays come back negative and was diagnosed with a bruised left foot Saturday, Tim Stebbins of MLB.com reports.
Martinez was pulled from Saturday's matchup against Detroit due to the injury, which occurred when he fouled a ball off his foot in the first inning. The fact that he initially stayed in the game bodes well for his likelihood of avoiding of a long-term absence, as does the negative X-rays. Still, it's too early to tell whether Martinez will need to miss additional time.