Adrian Gonzalez got the start at first base, while Will Middlebrooks played third. Cody Ross was the right fielder, with Daniel Nava in center.
Now that Ross is back and Nava seems to be recovered from his thumb injury, Valentine sounded as if he won't be as inclined to play Gonzalez in the outfield.
That could leave him with a frequent decision of whether to sit Youkilis or Middlebrooks.
"It's a real humid night like last night, running a lot, [Youkilis] playing his butt off," said Valentine. "It's tough. I'm not going to put Adrian in the outfield when I have enough outfielders, that's for sure."