DeSclafani didn't receive a qualifying offer from the Giants, Jeff Passan of ESPN.com reports.
DeSclafani performed well during his first season with the Giants with a 3.17 ERA and 1.09 WHIP in 167.2 innings across 31 starts. However, he'll now become a free agent with no draft-pick penalty attached after San Francisco declined to offer him a one-year, $18.4 million deal.