Though Jonny Gomes has taken over as the primary left fielder, Carp's injury did open the door for Daniel Nava to be recalled from Triple-A Pawtucket again just two days after he was sent down.
For whatever reason, Nava hasn't been able to find the stroke that made him an invaluable player for the Red Sox last year.
"He is working hard to get that stroke that was so productive a year ago," Farrell said. "We know there's a good hitter in there. The bottom-line results haven't been maybe what he's realized and produced in the times that he's been in the big leagues, particularly last year. He was part of the most productive left field in baseball last year. And we're working to get that back and he provides the same versatility defensively and yet we've got to get him back on track swinging the bat."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.