"I can't tell you how many MRIs that we have done to make sure that we were not putting him at risk," said Coach Nick Saban. "The MRI showed that he probably should not continue because he is at risk."
With Seau on IR and Zach Thomas out for Sunday's game at Oakland because of his shoulder injury, the starting lineup at linebacker will have Channing Crowder in the middle, Donnie Spragan on the strong side and Derrick Pope on the weak side.
As for Seau, he said he definitely was planning on coming back next season. That's a different stance than last year when he said shortly after sustaining a season-ending pectoral injury that he wasn't sure he would continue his career.
"The plan is that I'm going to be healthy, ready to play with two legs rather than one," Seau said. "I'll be back. It might not be here, but I'll be back."
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Quarterback Gus Frerotte experienced no problems with his right index finger on Wednesday and he will be in the starting lineup against Oakland. Safety Lance Schulters, meanwhile, sat out practice because of soreness in his neck and he's listed as questionable.
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The Dolphins have claimed linebacker T.J. Hollowell off waivers from the Jets and waived defensive tackle Josh Shaw to make room for him.