"At this point, there was an ultrasound done," Farrell. "An MRI is a possibility if the increased baseball activities tomorrow warrant it. The plan is for him not to have it right now. He'll ramp up the activities. If there's any kind of reproducing of the symptoms, then it would be administered at this point. Hopefully he gets through tomorrow and then we're looking for game activity on the weekend."
Drew experienced some unexpected discomfort during his second round of batting on Wednesday in Baltimore.
Jonathan Herrera again started at shortstop in Drew's absence and went 2-for-4 with a key two-out triple.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.