Phillies assistant general manager Scott Proefrock tried to sort out the process on Saturday.
"Basically, we designated him for assignment so we have 10 days to either trade him or assign him to the Minor Leagues," Proefrock said. "That could be an outright assignment, or an optional assignment. He has options left, and because we're not at 40 on the 40-man roster, that's still an option for us."
Ruiz was hit in the back of the head by a broken bat by Jason Kubel in the eighth inning on Friday. He left the field under his own power, but was taken to Thomas Jefferson Memorial Hospital for tests. Ruiz passed all the evaluations and did not suffer a concussion, Proefrock said.
Ruiz will be tested further Saturday and Sunday.
"We didn't want to DL him because we don't think it'll be that lengthy of a process, we're certainly hopeful it won't be," Proefrock said. "But we still need to have somebody who can catch for us."
Mathieson still has options left, but the Phillies made the decision to designate him for assignment and hope he clears waivers.
It is an abrupt turn to a fairytale 48 hours for the 26-year-old Mathieson, who appeared in his first game for Philadelphia on Friday after two Tommy John surgeries since 2007.
He arrived on Thursday in New York beaming after being called up with the injury to left-hander Antonio Bastardo. On Saturday, he was trying to sort out what exactly happened, and holding back some obvious disappointment.
"It's just kind of wait and see I guess," Mathieson said.
Mathieson allowed two runs in two-thirds of an inning Friday, but Proefrock said the move had nothing to do with his performance.
"It's a roller coaster, right?" Mathieson said. "Ups and downs. I was glad to be back up here. Yesterday wasn't what I was hoping for, but there will be another chance."