SEATTLE -- Houston Astros shortstop Jeremy Pena left Saturday night's 8-7 loss to the Seattle Mariners in the fourth inning because of right posterior knee tightness.
Pena exited the game as a precaution and will get imaging done Sunday.
"I just felt the back of my knee tightening up," he said.
Pena singled off starter Luis Castillo in the fourth, advanced to second on Yordan Alvarez's flyout and went to third on an RBI single by Isaac Paredes.
As the Mariners made a pitching change, pinch-runner Nick Allen replaced Pena at third.
Pena said his knee tightened up during Houston's 9-6 loss on Friday, but he finished the game. He went 1-for-5 with a run scored.
"I didn't tell anybody, which I probably should have," he said. "I woke up today feeling really good, went into the game feeling really good. And then it tightened up on me.
"I think it's best to stay on top of it."
Pena is batting .256 with five runs scored this season. He was the World Series MVP and American League Championship Series MVP as a rookie in 2022.
Pena made his first All-Star team last year, when he batted .304 with 17 home runs, 62 RBIs, 20 stolen bases and an .840 OPS in 125 games.
