"What going to New York did, it put him at ease and me at ease," Sherman said. "About Monday (Glenn) said, 'I just want to practice. I'm just going to put it behind me and deal with it.'
"We sat down as a staff and decided that's not the best thing. Let's get some finality at least to the diagnosis and make sure that what we're saying is accurate. We sent him to the best (specialist) that we could find and feel confident (in the diagnosis).
"I think it's a relief to (Glenn) also, to know that an outside opinion validated what we were doing."
The diagnosis means that Glenn's symptoms of migraine headaches and nausea are likely the result of an earlier head trauma. While the exact event of that head trauma cannot be determined with any certainty, Glenn's symptoms date back to the season opener, September 8, when he took a hard blow to the head after a catch.
"He's had headaches since the Atlanta game," Sherman said. "He has not mentioned them to us until last week, however. He's just been dealing with them, but then they got to the point where he had a hard time dealing."
Last week Glenn was held out of team practices and then managed only to play the first half of Sunday's game against the Carolina Panthers. He made a 17-yard reception on the Packers' opening scoring drive, but did not return to the field after complaining of migraines at halftime.
Glenn returned to practice Wednesday. His status on Monday will be determined by how he responds to the anti-migraine medication.
"I'm not going to say that he's back just yet," Sherman said. "I think it's going to take a little bit of time before the headaches dissipate to the point where we don't have to worry about them.
"It's not the headache you have after a couple Miller Lights, this is a headache that you might have if someone hit you over the head with a sledgehammer.
Glenn said his headaches come and go. At their worst, he said the migraines make him feel as if his head is going to "crack open." Although he experienced some dizziness in practice Wednesday, Glenn indicated that he's already feeling some positive affects from the medication and that he hopes to be able to play against the Bears.
"I'm going to give it all I've got and hopefully I'll be out there," he said. "I don't want to miss anything."