Redskins head coach Joe Gibbs said Monday afternoon that the team will be without the services of kick returner Chad Morton and defensive back Andre Lott for the remainder of the season.

"It's a shame, because both of those guys worked extremely hard this year," Gibbs said the day after his team dropped to 2-5 with an exceptionally frustrating loss to the Green Bay Packers at FedExField.

Morton sustained a knee injury and Lott tore a pectoral muscle against the Packers; both injuries are likely to require surgery. Those two players are expected to be placed on the injured reserve list.

Also on the injury front, LaVar Arrington's knee injury is likely to keep him out for as much as four additional weeks.

Team medical officials said the bone bruise suffered by Arrington can't be rushed and that it needs more time to heal. He had arthroscopic knee surgery on Sept. 24 and has missed the last five games.

"We have to be real careful with [Arrington's injury] and we'll just take it day to day," Gibbs said.

James Thrash and Ladell Betts are expected to take over for Morton on punt and kickoff return duties. In Sunday's game, Thrash returned two punts for an 8.5-yard average and Betts returned two kickoffs for a 28.5-yard average.

Lott had started the Green Bay game for Sean Taylor, who was deactivated. Taylor is expected to return to the lineup this Sunday against Detroit and he would rejoin Ryan Clark, who took over for Matt Bowen earlier this year. Bowen is also out for the year with a knee injury.