Rios fouled a ball off his left foot during an eighth-inning at-bat against the Cleveland Indians and left the game after he was visited by manager Robin Ventura and trainer Herm Schneider.
"It was very sore right after I hit it. When I stride and stepped to swing at the next pitch, it was really sore when I turned my foot," Rios said. "But I don't think there's anything major or even if I'm going to miss any time. I'm going to get some X-rays now and it should be OK, hopefully."
The Pittsburgh Pirates recently had been showing the most trade interest in Rios, who knows that injuries are common in a long season.
"I see this as part of the game and it's not a major injury," Rios said. "So I should be fine and ready to go in a few days or maybe tomorrow even."