Smyly had a strong start for Team USA in the World Baseball Classic against Venezuela on March 15, but he was hit hard in a Minor League game on March 21, then gave up three home runs in his final Cactus League start during a four-inning stint against the Reds on Sunday.
Servais said he'd have more information after the 27-year-old was checked out by doctors later Wedneday.
"At this time of spring you're always a little concerned," Servais said.