Giancarlo Stanton is considered day-to-day with a strained right quad, Yankees manager Aaron Boone said Sunday.
Cameron Maybin will replace Stanton in the starting lineup for Game 2 against the Astros Sunday night.
"He kind of injured his quad last night … he didn't feel like he was good to start," Boone said. "We hope it's something that with today and the off day, he would be back to play for Game 3."
Stanton, who played only 18 games this season because of injuries, suffered the strain running to first base on his first hit in Game 1 Saturday. He later homered off Astros starter Zack Greinke in the Yankees' 7-0 win.
Boone said Stanton would be available as a pinch hitter or in an emergency situation for Game 2. If the Yankees opt to replace Stanton on their ALCS roster, he would be ineligible for the World Series should the team advance.