On the first official day of camp for position players, Charlie Tilson suffered a stress “reaction” in his right foot. He’ll be held out of activities for the next 10 days. He suffered the injury on Friday and had an MRI on Saturday. After the 10 days, Tilson will be re-evaluated.

Tilson, who the White Sox acquired from the Cardinals in exchange for Zach Duke, went down in his only game for the White Sox with a torn hamstring. Despite that injury, he’s been penciled in as the starting center fielder for the Sox this season.

This immediately throws the White Sox onto their center field depth. The front-runner would likely be Peter Bourjos. With almost 400 starts in center at the major league level, he seems the most likely candidate to fill that spot. Last September, Leury Garcia became the de facto center fielder for the White Sox. Since he is likely out of options, he’ll at least get some time as well. Finally, the Sox will have Adam Engel and Jacob May down in Charlotte so they may get a look as well for the center field and fourth outfielder jobs in case Tilson’s injury carries on throughout camp.