Casilla, 30, has hit .247 in nine Major League seasons with Minnesota and Baltimore. Over 38 games with Durham and Toledo this year, he has hit .315.
Casilla has played second base, shortstop and third base in the Majors.
Joey Nowak is a reporter for MLB.com. Follow him on Twitter at @joeynowak. This story was not subject to the approval of Major League Baseball or its clubs.