Olt (hamstring) is on track to be called up to Chicago on Friday, Jesse Rogers of ESPN 1000 reports. Olt is set to play a couple rehab games with Low-A Kane County the next couple days, and if all goes well, he will join the big club Friday. Olt may not see regular starts in September, but the Cubs will likely work him into the lineup at least a couple times per week to make sure he gets at-bats.