Collins signed a minor-league deal to return to Washington on Friday, Jorge Castillo of The Washington Post reports.
Collins made his first appearance in professional baseball since 2014 this summer, following a pair of Tommy John surgeries. Over 18 games with various affiliates in the Nationals' system, the 28-year-old posted a 7.79 ERA and 1.79 WHIP while holding a 23:14 K:BB. Collins still has a lot of work to do to prove he can regain his old form, making him a long shot to return to the majors in 2018.