Miami Dolphins linebacker Zach Thomas was ruled out of Sunday's game against the Buffalo Bills as a result of recurring migraine headaches.
The news comes just one day after Thomas participated in his first full- contact practice since being involved in an automobile accident on October 21 that resulted in whiplash.
"It's kind of day-to-day and that's the way we approached it, and then we came to that conclusion and he will not practice today," Dolphins coach Cam Cameron said. "(Zach) had a good practice yesterday, but as we're finding out in these situations, one day isn't always indicative of the next day and we've kind of been through this and that's what we're learning. He was positive yesterday, he came in this morning and things were not quite the same and again that's the recommendation of our medical staff."
Thomas missed two games earlier this season with a concussion and the whiplash injury forced him to sit out the team's last game against the New York Giants prior to last week's bye. He will be replaced in the lineup at middle linebacker by Channing Crowder, while Derrick Pope moves into Crowder's outside linebacker position.