"This isn't a development setting right now," manager John Farrell said. "It is still about us going out and winning. ... We have gone through a number of changes because we have all contributed to the record up to date, but the priority is to win."
This is Victorino's third trip to the DL this year. He's missed 71 games this season because of a right hamstring strain. Victorino underwent an MRI on his sore lower back Friday.
"I think, until we get the information back, it's probably too early to tell," Farrell said of a timetable for Victorino's return. "The one thing we do have right now is we have some time on our side, so whatever is recommended for Vic to get back to full strength, if we use the remaining months in this calendar year to our advantage, we'll see if that makes sense."
Carp, meanwhile, said two weeks ago that he wanted more playing time. He missed a month with a fractured right foot and is batting just .198/.320/.279 in 86 at-bats this season. Last year in a similar role, he hit .296/.362/.523.
"In the role that he is very good at, in that platoon/bench role, he didn't seem to get on track as much as he did a year ago. That was frustrating for him," Farrell said. "He had a strong desire to get more consistent at-bats, which I can respect. With the additions we just got, those at-bats would have been even more limited. We felt like it was a chance to let him seek an opportunity better for him."
The roster changes over the past few days could mean less playing time for some, namely Daniel Nava. Farrell said Nava won't be in a strict platoon, and added that the team is "going to make sure Daniel gets on the field." The switch-hitter has an .815 career OPS against righties and a .587 mark against righties.
Brock Holt has missed just one game since he assumed the leadoff role on May 23. He's played every position this year except pitcher and catcher. Farrell said Holt will see time in center field against lefties, and against righties, the left-handed hitter will play shortstop and third base. Both Middlebrooks and shortstop Xander Bogaerts hit right-handed.
"We see his alignment being in those three positions," Farrell said.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. Steven Petrella is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.