KANSAS CITY -- Royals All-Star catcher Salvador Perez exited Friday night's 5-2 loss to the Mariners in the seventh inning after striking out to end the sixth.
"We don't know [Perez's status] right now," manager Ned Yost said after the game. "He's over getting an MRI. We'll know more tomorrow."
Perez, who appeared to wince in pain after swinging at strike three, has dealt with tightness on either side of his rib cage this season. Perez is batting .278 with 21 home runs. He was replaced by Andrew Butera.
"It's the right side, but it's a different spot," Yost said. "It's a little more concerning."