After Boston missed out on the Jon Lester sweepstakes, the team felt the need to make changes to its rotation, and quickly.

It all began on Thursday, with the team officially acquiring Rick Porcello from the Tigers in exchange for Yoenis Cespedes, Alex Wilson and Minor Leaguer Gabe Speier. Later in the day, the team officially signed Justin Masterson to a one-year, $9.5 million contract.

Then on Friday night, the team acquired All-Star left-hander Wade Miley from the Arizona Diamondbacks in exchange for Rubby De La Rosa, Allen Webster and Minor Leaguer Raymel Flores.

"When you see that all are under 30 years of age, they should be in their prime," Farrell said. "When you start to look at starting pitchers who excel in the season and during the postseason, they are guys that are in their 20s."

Right now, the Red Sox rotation will be: Clay Buchholz, Joe Kelly, Porcello, Masterson and Miley. It's a group that lacks a true ace.

Nelson discusses the Red Sox's pitching acquisitions

MLB.com's Jeff Nelson discusses the Red Sox's pitching acquisitions in Justin Masterson, Rick Porcello and Wade Miley

"Every guy that evolved into a No. 1 kind of pitcher, they had opportunity and they had support and they performed their way into those roles," Farrell said. "We feel like there are candidates like that in the rotation who could emerge into that. The guy that goes to the mound, he's the No. 1 starter."

Signed by the Tigers as the 27th selection overall in the the 2007 First-Year Player Draft, Porcello has made at least 27 starts and pitched at least 162 2/3 innings in all six big league seasons since his 2009 debut.

The right-hander is coming off a career-best season in which he went 15-13 with a 3.43 ERA.

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In span of days, Red Sox revamp rotation