Rodriguez (right knee inflammation) has been on the DL since April 21, retroactive to April 20, and Hurdle has a reason for waiting until Friday to check on him.
"The last time this flared up, it flared up the day after he pitched," Hurdle said before Thursday's doubleheader against the Orioles. "We'll know more tomorrow."
Rodriguez has an 0-2 record with a 7.65 ERA in four starts, and he had problems throughout the first month.
He also had an MRI and had fluid drained from his right knee before going on the DL.
Jeff Seidel is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.