Bonderman, 30, posted a 67-77 record with a 4.89 ERA in eight seasons with Detroit, with arm problems plaguing his final few seasons.
But the big right-hander had Tommy John surgery in April and said he's now getting back to full strength, already able to throw fastballs off a mound, and looking forward to competing for a job this spring with the Mariners.
"I got my elbow fixed and now I feel ready to roll," Bonderman said Friday from his home outside Pasco, Wash. "I feel like I've got a little left and I want to enjoy it."
Bonderman said he's been working out hard and has lost about 20 pounds from his final playing days with the Tigers, now packing about 220 pounds on his 6-foot-2 frame. He'll report to the Mariners camp in Peoria, Ariz., about a month early to begin working with the team's athletic trainers to prepare for his comeback.
"I had a lot of success in Detroit, but my arm just gave out toward the end of my career there," he said. "It's not the way I wanted to finish up, but I think I can come back and stay healthy and find a way to get it going and get my career back on line. I'd like to play a few more years and see what happens."
Bonderman went 8-10 with a 5.53 ERA in 30 games in 2010, then was out of baseball in 2011 before getting a tryout with the Indians. It was during his physical with Cleveland that his elbow injury was revealed and he underwent Tommy John surgery.
Bonderman was originally selected by Oakland 26th overall in the 2001 First-Year Player Draft following his junior season at Pasco High School. He made a quick rise to the Major Leagues, making only 27 Minor League appearances before arriving in the Majors. He was traded to Detroit on Aug. 22, 2002, and made his Major League debut as a 20-year-old in the Tigers starting rotation in 2003.
The Mariners have an opening in their rotation after trading Jason Vargas to the Angels this week for Kendrys Morales and are still interested in adding another veteran either through free agency or trade.