- Catcher David Ross was placed on the seven-day concussion disabled list. To fill his spot on the roster, right-hander Alex Wilson was recalled from Pawtucket.
Both Lavarnway and Wilson are expected to be available for the second game of today's doubleheader against the Rays at Fenway Park at 8:05 p.m.
Executive Vice President/General Manager Ben Cherington made the announcement.
Buchholz, 28, has gone 9-0 with an American League-leading 1.71 ERA (16 ER/84.1 IP) in 12 starts for Boston this season. The Red Sox have an 11-1 record in his starts in 2013. Buchholz last pitched on June 8 against the Los Angeles Angels of Anaheim.
Lavarnway, 25, returns to the Red Sox for his third major league stint of the season. In three games for Boston this season, he has hit .250 (2-for-8) with 2 RBI. In 38 games for Pawtucket this season, he has hit .261 (36-for-138) with nine doubles, three home runs and 21 RBI.
Ross, 36, was also on the seven-day concussion disabled list from, May 12-24. He originally experienced concussion symptoms after taking a pair of foul balls off his catcher's mask on May 11 against Toronto. In 23 games for the Red Sox this season, he has hit .185 (12-for-65) with two doubles, four home runs and six RBI.
Wilson, 26, will begin his third stint with Boston this season. In 17 appearances out of the bullpen for the Red Sox in 2013, he has gone 1-1 with a 2.61 ERA (6 ER/20.2 IP). His last major league appearance was last Thursday at Baltimore. In eight games for Pawtucket, he is 1-1 with a 4.22 ERA (5 ER/10.2 IP) with three walks and 12 strikeouts.