The Raiders have not scored a touchdown with their first-team offense this preseason.

"Obviously we haven't done what we expected to do, but it's not a concern," Carson Palmer said. "We just need to clean some things up. We've made a handful of mistakes and hurt ourselves, but it's not concerning."

Palmer said at this point in camp he's trying to fine-tune things such as reads and footwork. Building a rapport with receivers, he said, is "always a work in progress."