Kelly left Wednesday's game against the Cardinals after appearing to have suffered a lower leg injury, Sean McAdam of CSNNE.com reports. Kelly's exact injury status at the moment remains uncertain, as reports have suggested anything from a knee to a calf injury. This clearly isn't what the Red Sox want to see after acquiring the right-hander as part of the John Lackey deal with the intentions of him filling many of the innings Lackey leaves behind. Consider Kelly day-to-day until more information is disclosed, leaving him questionable for his next scheduled start. He allowed one run on three hits and two walks prior to exiting.