The winless Miami Dolphins continue to be forced to find new options at backup quarterback.
The Dolphins signed J.P. Losman on Tuesday and placed veteran Sage Rosenfels on the reserve/non-football illness list.
Rosenfels, who backed up Matt Moore, didn't play in a game for the Dolphins after signing with the team Oct. 6, when injured starter Chad Henne was placed on injured reserve with a season-ending shoulder injury.
Rosenfels was released by the New York Giants in August after a mysterious blood infection left him hospitalized. Rosenfels, who had been cleared to join the Dolphins, indicated in a statement given to FOXSports.com that re-occurring health concerns won't allow him to continue playing.
"I am thankful for the opportunity the Dolphins gave me to come here and play," Rosenfels said in a statement issued through his agent, Rick Smith. "I was looking forward to contributing to the team when I signed.
"When I first joined the Dolphins, all tests showed that I was healthy and ready to go. But after practicing for a few weeks, especially in the heat, some new indications made it obvious that I need to rest and allow my body to regain all requisite strength. I want to thank the Dolphins for their understanding and wish them the best of luck the rest of the season."
Losman most recently had short stints with the Oakland Raiders (2009) and Seattle Seahawks (2010), and he played the 2009 UFL season with the Las Vegas Locomotives. He was a first-round draft pick (22nd overall) by the Buffalo Bills in 2004 and went 10-23 as their starter from 2005 to 2008.
The Dolphins (0-6) next play on the road Sunday against the New York Giants (4-2).
The Associated Press contributed to this report.
