In better news, right tackle Earl Dotson, who has missed three straight starts with a bad back, returned to practice.
Driver severely bruised and strained his right shoulder Sunday, while Sharper suffered his knee sprain the previous week.
Sherman said right now there is no way to predict if these two key players will take the field in Saturday's playoff game vs. Atlanta.
"We just have to play it day by day, I wish I could tell you when," Sherman said. "Certainly, they have to make strides in their rehab and, as of today, they weren't out there. Both men have improved their status in my mind and so we'll see how they handle the rest of the week.
"Unfortunately for us, it's not a normal week. We're playing on Saturday instead of Sunday as you know, so things have to happen very quickly for us."
Sherman was impressed by the progress made by Dotson, who hopes to play Saturday. Dotson turned in a spirited workout Tuesday.
"He did fantastic," Sherman said of Dotson. "I'm very excited about what he did in practice. Very physical, even though we were not in pads today, he was very physical and his demeanor, his pad level, his execution, I thought, was exceptional considering he hasn't had many reps in practice."
In other injury news, other missing Tuesday's practice included cornerback Tod McBride (groin), nose tackle Gilbert Brown (legs), and wide receiver Robert Ferguson (lower back strain).
Sherman reported that Brown was walking better on Tuesday, however.