Coming back from knee surgery, Swisher played his first game of the big league exhibition season on Wednesday as a designated hitter. Walters has a strained oblique muscle.
The Indians also announced that reliever Austin Adams will make the Opening Day roster. Adams, who pitched in six games over three stints with the Indians last year, earned a spot in an eight-man bullpen.
"Eight pitchers can set up our staff for a week," manager Terry Francona said. "It allows us to go with a short bench, when games get spread out, having an extra arm helps a lot."
Adams was selected by the Indians in the fifth round of the 2009 amateur draft.
"Austin has a big arm," Francona said. "He is working diligently on his breaking ball."
Aguilar hit .381 in 21 games during spring training.
"Sitting isn't going to help him," Francona said. He needs to go play. It wasn't what he wanted to hear but it will be good for him to play."
Martinez hit .263 in 24 exhibition games.