DAVIE, Fla. -- With five snaps under his belt, third-stringer Sage Rosenfels is the Miami Dolphins' most experienced healthy quarterback, and he may make his first NFL start by default Sunday against the archrival New York Jets.

	Lucas

Ray Lucas is questionable for the game against his former team because he bruised his right shoulder during the second quarter of Monday night's 24-10 loss at Green Bay. He left the game and Rosenfels went 0-for-3 in his first NFL appearance before Lucas returned and played the entire second half.

An MRI exam of Lucas' shoulder Tuesday showed no tears or broken bones, and it's uncertain whether he'll be able to practice this week, coach Dave Wannstedt said.

"He was hurting pretty good this morning,'' Wannstedt said.

Lucas again struggled in his second start replacing Jay Fiedler, who is expected to miss at least two more games with a broken right thumb. But the performance was an improvement on Lucas' six-turnover showing two weeks earlier in a loss to Buffalo.

"Ray was playing well enough to give us a chance to win,'' Wannstedt said. "We obviously didn't help him.''

Lucas went 22-for-39 with two interceptions, including one returned 89 yards for a touchdown by Darren Sharper. Many of his 198 yards passing came after Miami fell behind 24-0.

The only other quarterback on the roster is journeyman Dave Dickenson, who has never played an NFL game. The Dolphins don't plan to sign another quarterback and will go with Rosenfels if necessary, Wannstedt said.

"If he has to play, the other guys have to step up,'' Wannstedt said. "That would be my approach: 'Let's give the guy a chance.' We have to step up on defense and be smart on offense.''

The 24-year-old Rosenfels, a former Iowa State star, was acquired Aug. 22 from the Washington Redskins for an undisclosed draft choice. Dolphins personnel chief Rick Spielman smiled when asked why Rosenfels failed to win a spot with the Redskins under new coach Steve Spurrier.

"They had two Florida quarterbacks on their roster,'' Spielman said. "And they had the first-round draft pick (Patrick Ramsey).

Sage is a young kid who has a lot of upside. The biggest knock on him coming out of college was if he had enough arm strength. He has proven in preseason and since he has been here that he has more than enough arm strength to do what he needs to do.''

Rosenfels was in the game at Green Bay for five plays.

"We didn't give him a chance to do much, obviously,'' Wannstedt said. "From a standpoint of going in and doing what was asked of him, and not doing anything dumb, and getting the snap, and those basic elements that you have to go through when you're a young kid playing for the first time, he handled them well.''

Reserve defensive back Ray Green, who dislocated his right elbow against the Packers, was placed on injured reserve Tuesday and will miss the rest of the season. He won't require surgery.

Left tackle Mark Dixon, who has missed the past four games with a sprained left ankle, is expected to return for the Jets game.

"Other than at quarterback, we're reasonably healthy,'' Wannstedt said.