"We're still working through some things as far as when we get to Seattle," Farrell said of the home series after Baltimore. "Whether or not we'll insert a righty or lefty is to be determined, and then we still have the ability to insert whatever day that could be. Could we give another guy a day rest, an additional day of rest, we have that as some flexibility."
Farrell didn't say which pitchers are under consideration, but did say left-hander Roenis Elias is one possibility. The Red Sox could play matchups in the short term with the fifth starter as well, and performance will be a factor in committing to one pitcher.
"One of the things that we'll factor in is we would look to match up as best as possible," Farrell said. "On one series, is it a left-hander? The other series is it a right-hander? And we've got the flexibility to do that."
Boston had an off-day before the three-game series against the Twins and has another off-day Monday. Farrell said Price would remain on his regular schedule, pitching Tuesday and Sunday.
The fifth spot has been in flux this season, the American League's best offense somewhat hiding an inefficiency in the rotation. Rodriguez returned from the disabled list and has made three inconsistent starts. Clay Buchholz was sent to the bullpen with a 6.35 ERA in 10 starts.
Joe Kelly started the season in the rotation, but is in the Minors after posting an 8.46 ERA. Henry Owens and Sean O'Sullivan have also started.
Brian Hall is a contributor to MLB.com based in Minnesota. This story was not subject to the approval of Major League Baseball or its clubs.