So the guessing game continues.
Philbin was asked Sunday when he met with reporters whether his decision would come this week.
"It could be," he said. "We're in a process right now. We watched the game, obviously. We discussed the game, obviously. And now we're starting to formulate some thoughts on Atlanta. We're certainly going to do more game-planning this week than we did the first two, there's no question about that. I was in a run-game meeting earlier this morning, and we're going to start nailing down our personnel.
"We may have a decision soon, or we may play it out another week. That's still up in the air. We certainly haven't come to any decision on that right now."
After an impressive preseason debut against Tampa Bay, Tannehill got the start against Carolina but led the Dolphins to only one touchdown in six drives. He also had four three-and-outs, and managed only one first down on two possessions in the final 2:46.
Tannehill finished 11-for-23 for 100 yards with no touchdown and no interception. He was sacked three times and Philbin said he was partly to blame for at least one of those for not stepping up in the pocket.
Matt Moore, for his part, had a second less-than-stellar preseason outing.
He completed only 5 of 15 passes against Carolina's second-team defense, compiling a passer rating of only 45.7.
The best Dolphins quarterback on the night actually was Pat Devlin, who's not really a contender for the job.
Devlin completed 13 of 20 passes for 118 yards and a fourth-quarter touchdown that brought the Dolphins to within six points of Carolina.
Devlin almost completed Miami's comeback from a 17-0 first-quarter deficit when he drove the Dolphins to a first-and-goal at the 8-yard in the final minute, but his second-down pass was intercepted in the end zone.
"Do we have to be better? Yeah," Philbin said of his quarterback play. "Were there some accuracy issues? Sure. Was there a time or two our quarterbacks could have stepped up to avoid pressure? Absolutely. At the end of the day, they didn't throw the ball away to the opposition until the last play of the game. And they did do some good things.
"I thought their game management was relatively good. Obviously, we need to be more productive, there's no question about it. But to think we were even in the game, at least offensively, the credit was we didn't hand the ball to the opposition a whole lot. I'm not sitting up here telling you we played well because we didn't, but you can compete and you can hang in there if you are a sound team and you don't turn the ball over."