Igarashi spent the 2011 season with the New York Mets and posted a 4.66 ERA in 38 2/3 innings at the big league level. He is expected to provide depth to the bullpen in Triple-A Las Vegas.
The 32-year-old Igarashi split last season between the Major Leagues and Minors. With Triple-A Buffalo, he allowed just three earned runs in 21 games.
Igarashi is 5-foot-11 and 200 pounds. His professional career in North America began in 2010, when he signed with St. Louis.