Baltimore, MD –  The Boston Red Sox activated third baseman Kevin Youkilis from the 15-day disabled list Tuesday and placed outfielder Cody Ross on the 15-day DL.

Youkilis is in the starting lineup at first base on Tuesday in Baltimore after missing the last 22 games with lower back stiffness. The 33-year-old was batting .273 with two home runs and nine runs batted in before making his way to the DL on May 2, retroactive to April 29.

Ross, 31, fractured the navicular bone in his left foot when he fouled a ball off his shoe during Friday night's game in Philadelphia. Ross has seen time at all three outfield positions this season and has hit .271 with eight home runs and 28 RBI over 37 games.

Effective yesterday, the Red Sox placed outfielder Ryan Sweeney on the seven- day concussion DL after the 27-year-old suffered an injury while making a diving catch during Saturday night's game in Philadelphia.

Sweeney has hit .311 with 14 doubles and 12 RBI in 34 games with the Red Sox this season.

With two outfielders now sidelined, Boston selected the contract of outfielder Scott Podsednik from Triple-A Pawtucket while transferring Daisuke Matsuzaka to the 60-day DL.

Podsednik was purchased by the Red Sox from the Philadelphia Phillies on May 12 and hasn't appeared in the majors since 2010 as a member of the Los Angeles Dodgers.