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Riordan signed a minor league contract with the Tigers on Monday, Matt Eddy of Baseball America reports.

Riordan's return to the U.S. produced passable results, as he posted a 3.58 ERA and 1.07 WHIP in five starts with Triple-A Toledo, although he did experience some struggles with Double-A Erie. Until the right-hander can be more consistent against upper-level hitters, he'll likely continue to act as organizational depth.