MILWAUKEE -- St. Louis Cardinals ace Adam Wainwright injured his left ankle while stumbling out of the batter's box in Saturday night's 5-3 win, and the Cardinals sounded concerned about how badly he was hurt.
"My foot just shut down on me," Wainwright said.
Wainwright was put in a walking boot and manager Mike Matheny said the clubhouse was "pretty somber" after the game against the Milwaukee Brewers.
"Well, we won't know for sure anything until we get a picture on Monday. But, it's in the back of his ankle and that's a bad spot," Matheny said.
The Cardinals said Wainwright will be re-evaluated back in St. Louis after the team's road trip ends Sunday.
"It's something in the back of my ankle so we'll see what it is on Monday," Wainwright said. "Everything right now is just all speculation."
Wainwright had a 2-0 lead when he stumbled getting out of the batter's box on his popup that led off the fifth inning. He was helped off the field by a trainer and left the game.
"It was by far the best I felt this year," Wainwright said. "I really had things working. I started changing arm angles a little bit, working in and out better than I have been and I just was having a lot of fun out there. It reminded me of last year a lot.
"Those strides I was talking about making over the course of the year, I started to make them today. That's the hardest part just knowing I was making such good adjustments, and now I've got a setback."
Wainwright was relieved by Mitch Harris, making his major league debut at the age of 29 after serving five years of active duty in the U.S. Navy following his graduation from the Naval Academy. He pitched 1 1/3 innings, allowing two hits, two walks and one strikeout.
"It's one of those bittersweet ... the last thing I want to see happen to Adam, but I was happy to finally get in there," said Harris, who struck out the first batter he faced.
The Cardinals also were without catcher Yadier Molina, who was forced out of Friday's 3-0 win over the Brewers after being struck on the right knee guard by a foul tip. Tony Cruz started in place of Molina.
"We're still hopeful that we're talking a day or so. We'll adjust as we need to," Matheny said.
The Associated Press contributed to this report.