MESA, Ariz. -- The A's claimed right-hander Chad Smith off waivers from Detroit on Thursday, a move meant to offset the loss of another relief option, Taylor Thompson, to injury.
The right-handed Thompson was forced to bow out of the bullpen competition because of a right-shoulder strain. He was placed on the 60-day disabled list to clear a spot on the 40-man roster for Smith and has been shut down indefinitely.
"We're going to have to back him off and get going with the exercise and so forth until we feel comfortable with him throwing a baseball," manager Bob Melvin said of Thompson, who was claimed off waivers from the White Sox this winter.
The 27-year-old attempted throwing several times in the last week, but "it seemed like it just got a little worse every time he went out there," Melvin said.
Thankful for the opportunity with the Tigers but very excited to be joining the Oakland A's! Back to the West Coast
Smith, 25, posted a 5.40 ERA in 10 appearances last year for the Tigers, who selected him in the 17th round of the 2011 First-Year Player Draft. In three Minor League seasons, Smith had a 2.68 ERA spanning 91 appearances.
Jane Lee is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.