Stay healthy in particular.
"We're going to hold out a lot of players," Mariucci said. "We have to healthy up for the Atlanta game. Some of our starters are going to play and then get out fast. And some of the starters are out. They're not going to play. I'm too much of a nervous wreck to risk anybody. We're going to, in general, let our young guys play, get one final look at these kids and then choose the right guys for this team."
Quarterback Jeff Garcia will not play and it's unlikely receivers J.J. Stokes and Tai Streets, cornerback Jason Webster and defensive tackle Bryant Young will even be in uniform. Stokes, Streets and Webster have missed the entire preseason with hamstring problems.
Mariucci also indicated the team may hold out tailback Garrison Heast and fullback Fred Beasley, who comprised San Francisco's starting backfield in each of the first three preseason games.
The Niners will announce their final roster cuts on Sunday, when all NFL teams must have their rosters at the regular-season limit of 53 players by 1 p.m.