The Tigers re-signed Rainey to a minor-league contract Wednesday.
Rainey was non-tendered by the Tigers last week, but he's now back in the organization on a minor-league pact. The right-handed reliever hasn't been the same since Tommy John surgery, posting a 5.79 ERA and 55:38 K:BB over 60.2 innings over the last two seasons at the big-league level.