"He's got to get some strength back, his weight back on and stuff like that," Mariners manager Scott Servais said. "He was down about six or seven pounds right away. He wasn't able to eat anything. I know we've given him a couple bags of IV fluids just to keep him going there.
"He was hanging low and trying to get his feet under him."
Rollins has appeared in eight games for the Mariners this season, putting together a 1-0 record to go along with a 4.05 ERA. In Tacoma, Rollins has a 2.05 ERA in 24 appearances.
The 26-year-old southpaw pitched one-third of an inning for the Mariners against the White Sox on Tuesday.
"He just gives us another arm there," Servais said. "We'll see. We may adjust going into the National League games we have coming up."
Dhiren Mahiban is a contributor to MLB.com based in Toronto. This story was not subject to the approval of Major League Baseball or its clubs.