"You exercise in steps, he'll get through the first one today and we'll see where he's at," Yost said. "Everything is moving in a positive direction."
Perez said he expects to return in minimal time, but there are more tests to be done.
"I think Sunday or Monday, I'll be back, that's what I think, but we have to wait, we have to go day by day," Perez said.
Perez also said he was considering switching to a hockey-style mask that would be more protective of his chin where he was hit two other times leading up to Saturday's injury.
Kathleen Gier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.