Are the Dolphins a playoff team? NFL.com senior analyst Pat Kirwan tackled that topic during his weekly live chat.
Ricky Williams will replace Brown and start for the first time this season. He'll also become the primary triggerman if the Dolphins run the wildcat formation.
"Who knows? May not even run it," a coy Sparano said. "Never know."
The game is the first Brown has missed since his season-ending knee injury in 2007.
At 32, Williams has rushed for 558 yards and is averaging a career-best 5.3 yards per carry.
"The guy takes tremendous care of himself," Sparano said. "This guy has worked like crazy for the year and a half that we've been here. Watching him work the way he works, you wouldn't think he's 30-plus years old."
The 1998 Heisman Trophy winner and 2002 NFL rushing champion has avoided the media for much of this season but spoke to them briefly Tuesday about starting.
"It's my job right now," he said. "Obviously I'll have to carry the ball a little bit more."
Copyright 2009 by The Associated Press