The Washington Redskins signed safety Tyrone Carter and fullback Carey Davis, addressing two positions that were hit with knee injuries to starters in Saturday's preseason game against the Baltimore Ravens.
Carter and Davis both practiced Monday. Carter has 53 starts over his 10 NFL seasons with Minnesota, the New York Jets and Pittsburgh. He started 12 games for the Steelers last year.
Davis also comes from Pittsburgh, where he started 10 games over three seasons but was used sparingly last year.
Redskins free safety Kareem Moore will be sidelined four to six weeks after undergoing surgery on his sprained right knee. The third-year player had an arthroscopic procedure Monday. He was injured defending a fake punt and went down without contact.
Moore had been one of the pleasant surprises of training camp, moving into a starting role after two seasons as a backup. Reed Doughty will take Moore's spot in Friday's game against the New York Jets. Chris Horton also will compete for the starting job.
Donovan McNabb wore a protective boot on his left ankle and did not practice. Fullback Mike Sellers has a minor knee sprain and also didn't take part.
The Redskins also released linebacker Chris Draft.