"We'll see how he is in a couple of days," Shanahan told reporters in Denver. "He's a little bit dehydrated. We'll just wait and see. I can't really tell you anything."
Kirk said that Jarious Jackson took all the snaps Friday and would start if Kanell is unable to play. Jackson was re-signed this week after being cut two months ago.
The former Notre Dame starter has only played in four NFL games in three seasons, completing 7 of 13 passes for 73 yards. The Broncos' final option at quarterback after Jackson is top receiver Rod Smith, the designated emergency quarterback.
The receiver position is already dangerously thin for Denver.
Ed McCaffrey (knee) and Chris Cole (ankle) were held out of the last two days of practice. Cole is listed as questionable and McCaffrey has been downgraded to doubtful. Shanahan listed 16 players on his injury report.
Meanwhile, Ravens coach Brian Billick announced that injury-prone nickel back Tom Knight will miss this game with a groin injury.
"It's disappointing, but it doesn't make sense to risk making it worse or hurting the team," Knight said. "I'm sure the other guys will do a good job and I'll be back next week."
Billick said rookie quarterback Kyle Boller practiced all week without aggravating his sprained left shoulder and took the majority of the repetitions.
"It's what a professional has to do," Billick said. "He knows he needs the reps. We were fortunate to get through the week without any aggravation of it, so we are in good shape."
"It's frustrating, but it's a business and there's nothing you can do except prove yourself again," said Brightful, whose punt return average has dipped to seven yards after tying Jermaine Lewis' franchise record with a 16.1 average as a rookie last year. "It's frustrating that I've had four returns over 15 yards called back this year, but there's nothing I can do about that. I'm handling it all right."
Brightful has one fumble this year on a punt, but recovered it. He's averaging 21.5 yards on four kickoff returns, which have primarily been handled by backup running back Chester Taylor. Ward averaged 10.6 yards per punt return last year for the Dolphins.
"I don't know exactly what the game plan is, but I'm going to be ready," Ward said. "I'm excited about it. You just have to be decisive, find a hole and hit it at full speed."
Aaron Wilson writes for the Carroll County Times.