Tests showed no other symptoms besides the whiplash, Miami coach Cam Cameron said today, but doctors recommended Thomas rest and not travel. He was not at practice.

"Obviously, that's unfortunate," Cameron said. "But there are some guys that are going to step up."

The 0-7 Dolphins play New York in Wembley Stadium on Sunday in the NFL's first regular-season game outside North America. Thomas was tested for the injury Wednesday in Pittsburgh.

The middle linebacker and his wife were driving after the Dolphins' 49-28 loss to the New England Patriots last weekend when their vehicle was hit on Florida's Turnpike. According to the Florida Highway Patrol, they were rear-ended in stop-and-go traffic by a driver wearing Patriots attire. Thomas was wearing a seat belt.

"You can't replace Zach, that's for sure," defensive end Matt Roth said. "You've just got to make due without him."

Thomas' agent, Drew Rosenhaus, said Thomas had a sore neck and was tested for both possible concussion symptoms and whiplash. He said Thomas' received a "very good report."

"This is not a long-term problem, by any stretch," Rosenhaus said.

Thomas — a 12-year league veteran who has made seven Pro Bowl appearances — has missed two consecutive games this season because of a concussion. He is among a group of key Dolphins — including quarterback Trent Green, safety Yeremiah Bell and running back Ronnie Brown — who have been injured this season.