The 6-5, 310-pound Brooks played both guard and tackle at the University of Maryland and was a two-time first-team All-ACC selection.
As for Hollowell, he was waived exactly a week after being claimed off waivers from the New York Jets.
Hollowell was inactive last Sunday at Oakland in his only game on the Dolphins' active roster.
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Coach Nick Saban didn't make any definitive pronouncement, but it appears Zach Thomas will try to play Sunday against Buffalo despite a torn labrum in his right shoulder. Thomas would be fitted with a harness.