GREEN BAY, Wis. (AP) -- The Green Bay Packers are shaking up their secondary, promoting safety Atari Bigby and cornerback Jarrett Bush and telling safety Marviel Underwood he'll be released on Friday.
Bigby replaced Marquand Manuel at strong safety with the Packers' first-string defense during last night's practice.
Bigby hasn't won the starting job yet, but Packers coach Mike McCarthy says he's seen enough in training camp to at least give Bigby a chance.
Bigby likely will start Thursday's preseason game against Jacksonville.
Manuel has more experience, but doesn't have Bigby's range.
Manuel also bore much of the blame for the Packers' vulnerability to big plays last season.
Bush, meanwhile, replaced Patrick Dendy as the Packers' third cornerback in last night's practice and likely will play with the first-team defense on Thursday.
McCarthy says Underwood did a good job of rehabilitating his knee from an injury a year ago but isn't back to the same level of play.
He says increased competition made him the odd man out.
