Eickhoff was removed from Wednesday's game after feeling a "tingling sensation" in his pitching arm," according to manager Pete Mackanin, Matt Gelb of The Philly Inquirer reports.
Eickhoff exited with a trainer in the top of the third inning after clearly lacking any heat on his fastball. The right-hander will see a team doctor following Game 1 of Wednesday's doubleheader, while more information should become apparent before the end of the day.