"You can't throw that many interceptions," coach Bruce Arians told the team's official website after the game, calling it a "poor" showing by the 37-year-old signal caller.
"I just didn't do a good enough job," Palmer said. "I put that solely on myself. I'm disappointed in myself. I just felt like had I made a handful of throws, we would have been in a different position."
Palmer spent much of the offseason resting his arm, hoping to solve some of the fatigue issues that plagued him early last autumn.
That didn't help on Sunday, with the veteran lacking accuracy on too many of his throws despite finishing with 269 yards and a touchdown.
It's too early to panic, but even Palmer admits the issues better be fixed in a hurry.
"We will get past it. I will get past it," Palmer said. "We've got another big road game playing in another environment similar to this next week [in Indianapolis]. Sunday can't come fast enough. We've got to get the work done, but at the same time, I can't wait to get this taste out of my mouth and move past this."