Ventura said the roster move gave him the opportunity to give Youkilis a rest for the day game following a night game and with the team traveling to Detroit for a key weekend series against the Tigers. Lopez started Thursday at third base.
"It's a day game and Youk's knee has kind of been barking the last couple of days," Ventura said. "Just clean it up and have him ready for [Friday]."
Catcher A.J. Pierzynski returned to the starting lineup Thursday after sitting out Wednesday's game. He is hitless in his last 14 at-bats and is 5-for-32 (.156) over his past 10 games.