Contreras is out of the lineup for Wednesday's game against the Cardinals.
After catching two straight to open the 2017 season, Contreras will give way to Miguel Montero behind the plate for Wednesday's afternoon game with John Lackey pitching. Contreras hit a game-tying, three-run home run on Opening Day and reached base twice Tuesday, but he's also struck out four times in seven at-bats in the early going.