Both teams' starters are expected to play at least the first half -- except Chargers running back LaDainian Tomlinson, who will sit out for the third straight game to avoid injury.
"It's a good test for us," Whisenhunt said. "We get to see where we are against a team that you know is a good football team. If we can improve and play better against a team like that, then I think that'll be something that we can really build on going into the season."
Still, it would be unwise to draw too many conclusions based on a preseason game -- even the third one, when starters typically see lots of action.
The Chargers have split their first two preseason games, losing to Seattle 24-16 and defeating St. Louis 30-13. Turner said he expects the other starters to be in for about 40 plays Saturday night, or a little more than a half.
"It's going to be the most extensive playing time our guys get," Turner said. "I like our guys to have that feeling coming out at halftime and preparing for the second half and going out and getting a series or two to start the second half."
"I thought we've improved from the first game to the second game," he said. "We're doing some things well. Still some things that's killing us, you know, the penalties and stuff like that. But for the most part, when we're out there moving the football and playing defense and special teams, we look pretty good."
"I think we got a lot better Week 1 to Week 2, and then we also made some mistakes differently, in different areas," Rivers said. "So let's see if we can correct those and still build on what we did good. We're coming along. I think it'd be a little scary if we were where we needed to be right now."
The Cardinals aren't anywhere close to where they need to be for the Sept. 10 opener at San Francisco on Monday Night Football. But they're going to have a good idea of how far they need to go after facing the Chargers, who return 19 starters, including all 11 on offense, from a team that won the AFC West.
"We'll know where we're at right away," Arizona defensive end Bertrand Berry said. "This is going to be basically the last dress rehearsal, if you will, for the starters of the preseason. So we want to come out and show well and show that we're ready to get the season started on the right foot."
Whisenhunt said the line has been making progress since training camp opened.
"I've seen some opportunities for some holes," Whisenhunt said. "I've also seen some things we need to work on better, coming off blocks, working together on our double-team blocks. But I'm pleased with the physicalness of our offensive line. We are improving in those areas."
Copyright 2007 by The Associated Press