Phillies manager Ryne Sandberg indicated about three hours before the game that Ruiz, who spent time on the DL in 2010 with a concussion, would be fine, but that obviously changed.
"He was under a little bit of watch," he said after the game. "He just had a headache and he checked with [head athletic trainer Scott Sheridan]. It was clear that he had something going on."
Backup catcher Wil Nieves already is on the DL with a strained right quadriceps, leaving the Phillies with Cameron Rupp and Hill to catch while Ruiz and Nieves recover.
Hill, 35, was hitting .240 with nine doubles, one triple, three home runs and 17 RBIs in 45 games for Lehigh Valley.
Collier, 23, appeared in 40 games for Reading this season, hitting .228 with five doubles, two triples and one home run.
Todd Zolecki is a reporter for MLB.com. Austin Laymance is a reporter for MLB.com. Follow him on Twitter at @jalaymance. This story was not subject to the approval of Major League Baseball or its clubs.