Law had his contract purchased from Triple-A Buffalo on Friday.
Law will take the roster spot of Alen Hanson, who was designated for assignment Friday. Prior to earning a promotion, Law compiled a 1.69 ERA and 0.94 WHIP with a 17:3 K:BB in 10.2 innings with the Bisons. The right-hander owns a career 3.83 ERA across parts of three big-league seasons (105.2 innings).