The one-time Mariners starter pitched in relief for the Red Sox's Triple-A affiliate in Pawtucket in 2013, posting a 1.55 ERA over 52 1/3 innings.
Rowland-Smith will remain with Triple-A Pawtucket. He has posted a 5-0 record over 27 relief appearances with a 1.58 ERA.
Rowland-Smith pitched for Team Australia in the World Baseball Classic. He last pitched in the majors in 2010 with Seattle and went 1-10 with a 6.75 ERA. He'll likely compete for a bullpen spot.