PITTSBURGH — Steelers safety Ryan Clark doesn't want his career to vanish in thin air.

Clark became almost deathly ill after playing in Denver's mile-high altitude two years ago, losing his spleen and gall bladder plus 30 pounds due to medical complications that ended his season. The Steelers (5-2) play in Denver again on Monday, and Clark and coach Mike Tomlin haven't decided if he will suit up.

"His physical health, his well-being, of course, is paramount," Tomlin said Monday. "We're going to attempt to do what's right, we're going to weigh all our options and we're going to come to a decision at some point later this week."

Clark practiced Monday as the Steelers returned from a full week off, and he has received medical clearance to play.

"I think before we considered anything, we needed to hear, 'OK, Ryan, you're at no extra medical risk to participate in this game than anyone else is,'" Tomlin said. "He and I have received that, but we're still going to proceed with extreme caution. We're not going to hurry this process."