Mushinski signed a minor-league contract with the Guardians on Friday and received an invitation to spring training, Chandler Rome of The Athletic reports.
Mushinski allowed eight earned runs over 11 innings in the big leagues with Houston last season. However, most of his time was spent at Triple-A, where the 28-year-old southpaw posted a 5.44 ERA over 44.2 frames. He will most likely fill in as organizational bullpen depth for the Guardians.