Overbay entered Tuesday's game hitting .077 with no hits in his first eight at-bats against left-handed pitching. Snider has also struggled, hitting .120 through his first seven games. Ruiz, who bats from the right side, has only one pinch-hit appearance this season.
"I've given that thought about two days ago, and I still haven't made up my mind about it," Gaston said. "Not so much as sitting [Overbay or Snider] out, but just to get Ruiz in there to get him some playing time. Which one I pick, I'm not sure yet, if I do one at all."
Gaston still has confidence in Overbay, believing the veteran first baseman can pull it together as he gets more at-bats this season.
"He's trying hard," Gaston said of Overbay, who will be a free agent after the season. "This is a big year for him, and hopefully he can pull himself out of that hole."