Martinez (thumb) was placed on the 10-day injured list Wednesday with a right thumb ligament strain, Jeff Jones of the Belleville News-Democrat reports.
The righty threw a side session this week after exiting Sunday's start with what was initially thought to be a bruised thumb. However, this latest development means Martinez will be sidelined until after the All-Star break, and it's unclear whether he'll require longer than a minimum stay on the IL. Lars Nootbaar was recalled from Triple-A in a corresponding move.