49ers have questions at cornerback

There is potential flux for the San Francisco 49ers at cornerback -- just in time to face Aaron Rodgers in an elimination game.

49ers coach Jim Harbaugh said Monday that Eric Wright will play for Carlos Rogers if Rodgers can't play Sunday at Green Bay in a wild-card playoff game. Rogers suffered a hamstring injury late in the win over Arizona on Sunday. He had an MRI on Monday and Harbaugh offered no details. However, Rogers said Sunday he felt fine and didn't think the injury was serious.

The 49ers added cornerback Perrish Cox on Monday to complete the 53-man roster. He filled the spot vacated when receiver Mario Manningham was put on injured reserve Friday. Harbaugh said the plan was to sign Cox before Rogers was injured.

The 49ers' pass defense has struggled in the past two games allowing 755 combined passing yards to Atlanta and Arizona. Much of those yards came late. Harbaugh indicated Monday he wasn't worried about the issue.

If Wright has to play for Rogers, the 49ers have faith. He has been an NFL starter and he's played well in a reserve role this season. The 49ers are deep at the position. Cox can play in dime situations, which often may be the case against the Packers.

The 49ers will certainly be in better shape if Rogers can play, but they can probably withstand the loss if he can't play. Even if Rogers' injury is not serious, he'd probably rest some this week during practice because hamstrings easily aggravate.