"I don't know if I wanted to expose him here at home," Fox said. "We'll kind of weigh that as we move forward. Anytime you don't have success it has an effect on you mentally."
Carr, signed to a two-year, $6 million free-agent deal in the offseason, has struggled with his new team. Since taking over as the starter when Jake Delhomme was lost to a season-ending right elbow injury, Carr has thrown three touchdown passes, five interceptions and has a passer rating of 58.3.
"I still have confidence in David Carr," Fox said. "I still think he has things to offer. I don't think it's gone as well for him, or for us, as we all expected. That doesn't mean that it won't move forward either."
Testaverde, if he remains healthy, will start Sunday against Jacksonville.
Copyright 2007 by The Associated Press