"He was pretty sore; I don't want to say sore, but stiff after his last outing," Showalter said. "He was a two- or three-day off for me. He was unavailable the last couple of days. I'm careful about yo-yoing young players that haven't done it. I don't think it's good business."
Gausman threw three times in relief over five days earlier this month, giving up two runs in 5 2/3 innings.
But he blew away some hitters, finishing with eight strikeouts and three walks. Still, last year's first-round pick in the First-Year Player Draft is adjusting to life in the bullpen now.
Gausman had a 2-4 record with a 5.77 ERA heading into Sunday's game against the White Sox. He's got 34 strikeouts and 12 walks in 39 innings this season.
Jeff Seidel is a contributor to MLB.com.
This story was not subject to the approval of Major League Baseball or its clubs.