The Tigers announced the move Monday after a 7-all tie with the New York Mets in 10 innings.
Pauley gave up five earned runs in 2 2/3 exhibition innings.
Pauley had a 2.15 ERA in 39 appearances for Seattle last season before being traded with starter Doug Fister in August. With Detroit, Pauley was 0-2 with a 5.95 ERA in 14 games and left off the postseason roster.
"I know I am better than I showed," Pauley said. "I can't blame anybody but myself."
Pauley, who was out of options, was competing for a middle-relief spot. Detroit also placed designated hitter Victor Martinez on the 60-day disabled list.