Lions sign CB Doug Evans
Starting cornerback Dre' Bly did not practice Friday because of a left hamstring injury and is listed as questionable for Sunday's game against Oakland. Bly has intercepted four passes and scored two touchdowns this season.
"He was in getting some rehab and treatment, and he's still hoping to play," Detroit coach Steve Mariucci said.
Cornerbacks Jimmy Wyrick (chest) and Rod Babers (shoulder) are listed as doubtful.
The Lions signed cornerback Jacoby Shepherd on Wednesday. Both Evans and Shepherd could play for the Lions (1-6) against Oakland (2-5) Sunday.
Detroit has lost three of its top four cornerbacks -- Chris Cash, Andre Goodman and Chris Watson -- this season to injuries.
Seattle cut Evans three weeks ago after he was used sparingly in two games. Evans, who has 27 interceptions in 154 games, was drafted by Green Bay in 1993.
Otis Smith, 38, has started the last four games at cornerback for Detroit. Smith signed with the Lions after New England cut him during training camp.
Defensive end Robert Porcher was added to the injury report Friday, questionable with a hip injury.
This story is from ESPN.com's automated news wire. Wire index