Cardinals place Adam Wainwright, Andrew Knizner on IL

The St. Louis Cardinals have placed right-hander Adam Wainwright and catcher Andrew Knizner on the injured list, it was announced Wednesday.

The 41-year-old Wainwright has been dealing with a right shoulder strain and left Tuesday’s 15-2 loss to the Miami Marlins in the fourth inning – his third consecutive outing of less than four innings.

During Wainwright’s difficult three-game stretch, he has allowed 20 runs and 24 hits. The Cardinals have been outscored 29-2 in his past two starts. The veteran, who is 3-4 with a 7.66 ERA, has said he would retire after the season – his 18th with the organization.

“There’s not a whole lot behind him at the moment,” manager Oliver Marmol said Tuesday. “This is a guy who’s meant a lot to this organization. We’re going to take a deeper look at this and he’s determined to finish well.”

Knizner suffered a right groin injury after being hit by a foul ball and was removed from Tuesday’s game after the fourth inning. He was taken to the emergency room as a precaution before being released Tuesday evening.

The catcher is hitting .227 with 5 home runs and 15 RBIs over 15 games this season.

In related moves, the Cardinals called up catcher Ivan Herrera, right-handed pitcher Dakota Hudson and lefty Zack Thompson from Triple-A Memphis. Pitcher James Naile was optioned to Memphis.

The Associated Press contributed to this report.