Seager suffered the injury while fouling the ball off his foot during Wednesday's game against the Orioles. He later hit a game-tying home run in the ninth inning.
"It's not that bad," Seager said of the injury.
Seager is batting .231 this season with 15 home runs and 49 RBIs.
"It's just something he's going to have to play with and play through. I don't think it's going to get much worse," manager Scott Servais said. "... Kyle grinds through it as good as anyone that I've been around in a long time. That's what makes him a really good player. He just continues to go out there and battle. Some guys let the little injury affect him; he doesn't let it affect him."