"Juan's getting some things worked out and should be all right in a couple days," said manager Mike Scioscia, adding that MLB rules prevent him from identifying the nature of the problem. "He's getting some things adjusted."
Rivera, off to a slow start hitting .239 and slugging .423 with 10 homers and 34 RBIs in 68 games, was replaced in left by Reggie Willits. Willits had a two-run single in the 6-4 loss to the Rangers on Wednesday night and is batting .259 with a .368 on-base percentage.
Scioscia indicated the problem with Rivera's eyes hasn't had a major impact in his offensive struggles. A notorious slow starter, Rivera is a .298 career hitter after the All-Star break compared to .264 before the break. His slugging percentage rises to .483 after the break, compared to .448 in the first half.
"If you look at Juan historically," Scioscia said, "the real impetus of his production comes in the second half of the season. He had been driving the ball better [lately]. Some of his numbers hadn't been where you'd hope they'd be, but he's swinging the bat better."