"I actually had him in the lineup [Tuesday]. Then I heard about it, went to see him and they sent him to the emergency room," Mattingly said. "It kind of blew up and it wasn't very pretty."
Turner was replaced by Carl Crawford as a pinch-runner in the ninth inning of Sunday's game against the Mets, but Mattingly said it wasn't something that was affecting Turner over the weekend.
"It wasn't something anyone was worried about until he got here today," Mattingly said. "It was this itty bitty thing then it turned into something a little more dangerous."
Turner is hitting .323 this season and has 13 home runs with 44 RBIs.
Steve Bourbon is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.