"He toughed it out (against Green Bay)," Wannstedt said. "He went in there and played the second half hurt and did the best he could. Whether he can play this week, it's questionable at this point."
It's not known whether Lucas will be practicing on Wednesday, although Wannstedt said if it were up to Lucas he would be out there.
In the event Lucas can't play Sunday night, the start would go to Sage Rosenfels.
Wannstedt and Dolphins personnel chief Rick Spielman both dismissed the possibility of bringing in former Cowboys Pro Bowl quarterback Troy Aikman or anyone else for that matter.
Rosenfels, picked up after he was waived by the Redskins in the preseason, saw his first NFL regular season action against the Packers, but went 0-for-3. In his defense, he faced significant pressure on two of his attempts.
Wannstedt said the offense would have to be tweaked a little bit if Rosenfels is at quarterback, but he expressed confidence in the team's ability to win with him.
"If he has to play, other guys have to step up," Wannstedt said. "The defense will need to step up and we have to be smart on offense with the football."
For his part, Spielman half-kiddingly said the reason Rosenfels was let go by Washington was because they had two Florida quarterbacks — Danny Wuerffel and Shane Matthews — on the roster and the other QB was a first-round pick (Patrick Ramsey).
"The biggest knock on (Rosenfels) coming out of college was whether he had enough arm strength," Spielman said. "But since he's been here, he's proven he can do the things we need him to do here."