Silseth was recalled from Double-A Rocket City on Saturday.
Silseth will start Saturday's game against the Rangers. Over his first six major-league starts, the right-hander has posted a 5.84 ERA and 1.46 WHIP in 24.2 innings, though he's been much sharper with a 2.01 ERA and 1.02 WHIP in eight starts spanning 40.1 innings with Rocket City this year.