The impending return of Rick Porcello to the rotation has motivated the Red Sox to option fellow starter Matt Barnes to Triple-A Pawtucket.
Reliever Jonathan Aro will take the place of Barnes on the roster until Porcello is activated for a start Wednesday against the White Sox, per MLB.com.
Barnes did not distinguish himself in two starts this week, losing both decisions and allowing 11 runs in 10 1/3 innings. He has given up eight homers in 23 appearances this season.