McBride, 30, hit .188 in 11 games for Nashville after signing a Minor League deal with the A's during the offseason. He is a .199 career Major League hitter in 72 games over parts of three seasons with the Rockies.
Triggs retired the side in order Monday in his Major League debut. He is 2-1 with a 5.14 ERA in six Triple-A appearances.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.