Dan Orlovsky has two fractures and a torn ligament in his right thumb, but the Lions have not yet put him on injured reserve.

Orlovsky, who suffered the injury on the first play of last week's 27-23 loss to Chicago, said Friday he will visit a second hand specialist at the beginning of next week to better determine a course of treatment. He could undergo surgery now or after the season, and could join Jon Kitna on IR as soon as next week. For now, the Lions are carrying four quarterbacks on their roster.

Lions coach Rod Marinelli also ruled center Dominic Raiola out for Sunday's game against Jacksonville. Andy McCollum will start in place of Raiola, who had started 104 straight games.

Daunte Culpepper, signed earlier this week as a free agent, is expected to start at quarterback Sunday in his Lions' debut. Culpepper has taken the majority of first-team reps all week in practice, working in front of last year's second-round pick Drew Stanton.

Marinelli did not name a starter Friday.